Answer:
12.5 hours
Step-by-step explanation:
The data which represents the battery life, in hours, experienced by six users is given below:
10 14 14 16 13 8
To determine the point estimate for the web browsing battery life of the iPad, we find the mean number of hours.
[tex]Mean=\dfrac{10+14+14+16+13+8}{6} \\\\=\dfrac{75}{6} \\\\=12.5[/tex]
The point estimate for the web browsing battery life of the iPad is: 12.5 hours
7. 12, 24, 4, 18, 12, 9
Using the data, create a histogram.
Answer:
import pandas as pd
vec = pd.Series([7.12,24,4,18,12,9])
vec.plot(kind = 'hist')
Step-by-step explanation:
You can use python for that.
By doing
import pandas as pd
vec = pd.Series([7.12,24,4,18,12,9])
vec.plot(kind = 'hist')
And this is the result you get
What is the length of AC?
Answer:
Step-by-step explanation:
the triangles are proportional
9/81=1/3
140-x/x=1/3
3(140-x)=x
420-3x=x
4x=420
x=420/4 = 105
Find the probability that a value randomly selected from this population will have a value greater than 130. b. Find the probability that a value randomly selected from this population will have a value less than 95. c. Find the probability that a value randomly selected from this population will have a value between 95 and 130.
Answer:
a) 0.0668
b) 0.3085
c) 0.6247
Question:
A population is normally distributed with μ = 100 and σ= 20.
a. Find the probability that a value randomly selected from this population will have a value greater than
130.
b. Find the probability that a value randomly selected from this population will have a value less than 90.
c. Find the probability that a value randomly selected from this population will have a value between 90
and 130.
Step-by-step explanation:
a) The probability that a value randomly selected from this population will have a value greater than 130 = P(X >130)
A z-score also referred to as a standard normal table shows the number of standard deviations a raw score lays either above or below the mean.
Let's determine the z-score using:
z = (x - µ)/σ
µ = 100
σ = 20
z = (130-100)/20
z = 30/20 = 1.5
The probability from the standard normal table associated with z = 1.50 is 0.4332. This is the area between z = 1.50 and the mean.
The total area under any normal curve is 1. Due to the fact that the normal curve is symmetric about the mean, the area on either sides of the mean is 0.5.
The desired probability = 0.5000 - 0.4332
= 0.0668
Find attached the diagram.
b) The probability that a value randomly selected from this population will have a value less than 90 = P(X<90)
Using the z-score formula:
z = (x - µ)/σ
z = (90-100)/20
z = (-10)/20 = -0.5
The probability from the standard normal table associated with
z = -0.50 is 0.1915. This is the area between z = -0.50 and the mean.
The desired probability = 0.5000 - 0.1915
= 0.3085
Find attached the diagram.
c) The probability that a value randomly selected from this population will have a value between 90 and 130 = P(90≤X≤130)
We earlier found the z score when P(X<90) = -0.5
And the probability associated with
z = -0.50 is 0.1915.
The z score when P(X>130) = 1.5
And the probability associated with z = 1.50 is 0.4332.
The desired probability is the addition of the two probabilities:
P(90≤X≤130) = 0.1915+0.4332
P(90≤X≤130) = 0.6247
We have two fractions,
and
and we want to rewrite them so that they have a common denominator
12 4.
(and whole number numerators).
imi
What numbers could we use for the denominator?
ent
Choose 2 answers:
A
12
ond
8
Band
nom
24
18
Answer:
Options (A) and (C).
Step-by-step explanation:
There are two fractions given as
[tex]\frac{5}{12},\frac{3}{4}[/tex]
If we rewrite the fractions by making denominators common we can convert the fraction as,
[tex]\frac{5}{12}, \frac{3\times 3}{3\times 4}[/tex]
Or [tex]\frac{5}{12}, \frac{9}{12}[/tex]
Similarly, both the fractions with common denominators may be[tex]\frac{5\times 2}{12\times 2},\frac{3\times 6}{4\times 6}[/tex]
Or [tex]\frac{10}{24},\frac{18}{24}[/tex]
Therefore, denominators of both the fractions will be 12 and 24.
Options (A) and (C) will be the answer.
Determine whether the following relation represents a function. Give the domain and range for the relation. StartSet (7 comma 2 )comma (5 comma negative 4 )comma (3 comma 3 )comma (negative 4 comma negative 4 )EndSet
Answer:
is a functiondomain: {-4. 3. 5. 7}range: {-4, 2, 3}Step-by-step explanation:
Given:
{(7, 2), (5, -4), (3, 3), (-4, -4)}
__
The domain is the set of first numbers:
{7, 5, 3, -4} . . . domain
The range is the set of second numbers:
{2, -4, 3} . . . range
No domain values are repeated, so this relation is a function.
The dimensions of the base of Box 1 are x by 3x.
The base area of Box 1 is:
3x
3.x2
3r3
4x
Answer:
3x²
Step-by-step explanation:
The area is the product of the dimensions of the base:
area = x(3x) = 3x²
need help pls on circle geometry
Answer:
25
Step-by-step explanation:
AB is a tangent to the circle hence the angle ABO is a right angle !!! With that knowledge we can construct a right-angled triangle with sides AB ,BO and OA .
Applying the Pythagorean theorem we get that OA is the hypotenuse and thus
[tex]oa = \sqrt{ab {}^{2} + ob {}^{2} } [/tex]
The driving distance from Chicago to San Francisco is 2,142 miles. The Hathaway family left Chicago on Monday morning, December 6. They averaged 50 miles an hour and drove 6 hours each day. On what day and date did they reach San Francisco?
Answer:
They arrive on Monday, December 13th
Step-by-step explanation:
First, we know that this family must drive a total of 2,142 miles.
They average 50 miles per hour and drive 6 hours each day, thus we can see that they drive (50)(6)=300 miles per day.
Now, to know how many days it will take them to drive the total of 2,142 miles we are going to divide the total amount of miles between the number of miles driven per day:
2,142÷300= 7.14
Thus, it takes them 7.14 days to drive 2,142 miles.
If we round this (since the number is greater than 7 this would mean it takes them more than 7 days and they would stop at 7 for the day) to the next digit, we would have that it will take them 8 days to get to San Francisco.
Thus, since they start on December 6th (day 1), December 7th would be day 2 and following this pattern we would have that the eighth day would be December 13th.
Now, since the days repeat every 7 days and we now that December 6th was monday, we would have that the day they arrive to San Francisco (December 13th) is monday too.
NEED HELP ASAP!!!!
The steps below show the work of a student used to calculate the number of yards in 6,436 meters.
(1 mile = 1,609 meters)
(1 mile = 1,760 yards)
Step 1: 6,436 meters multiplied by conversion factor 1 mile over 1,609 meters equals 4 miles
Step 2: conversion factor of 1,760 yards over 1 mile divided by 4 miles equals 440 yards
Step 3: 440 yards
(1 mile = 1,609 meters)
(1 mile = 1,760 yards)
How can the error in the student's work be corrected? (1 point)
a
The 6,436 meters and the 1,609 meters in Step 1 should be switched.
b
The 1 mile and the 1,609 meters in Step 1 should be switched.
c
The conversion factor should be multiplied in Step 2 instead of being divided.
d
The conversion factor should be added in Step 2 instead of being divided.
Answer:
You usually wouldn't divide lengths
Step-by-step explanation:
A collection of 36 coins consists of nickels, dimes and quarters. There are three fewer quarters than nickels and six more dimes than quarters. How many of each kind of coin are there?
Answer:
9 quarters, 12 nickels, and 15 dimes.
Step-by-step explanation:
Let's start by naming the number of quarters x.
That means that the number of nickels is x+3.
(There are three fewer quarters than nickels)
The number of dimes would be x+6.
(There are six more dimes than quarters)
We know the total number of coins is 36.
We can set up an equation.
quarters+nickels+dimes=36
x+x+3+x+6=36
Combine like terms.
3x+9=36
Subtract 9 from both sides.
3x=27
Divide both sides by 3.
x=9
There are 9 quarters.
Use given info to find the number of other coins.
9+3=12
There are 12 nickels.
9+6=15
There are 15 dimes.
Four different positive integers have a product of 110.
What is the sum of the four integers?
Given:
Four different positive intergers as a product of 110
To find:
The sumnof the four numbers whose product is 110
Solution:
1) To find the number we have to find the prime factorization of the given number 110
2) Prime factorization of 110 is
110 = 1×2 × 5 = 11
3) So the four numbers whose product is 110 are 1,2,5 and 11
4) The sum of number's are
1+2+5+11=19
SO THE FINAL ANSWER IS 19Pew Research Center is a nonpartisan polling organization that provides information about issues, attitudes, and trends shaping America. In a poll, Pew researchers found that 47% of American adult respondents reported getting at least some local news on their cell phone or tablet computer (Pew Research website, May 14, 2011). Further findings showed that 42% of respondents who own cell phones or tablet computers use those devices to check local weather reports and 37% use the devices to find local restaurants or other businesses.
a. One statistic concerned using cell phones or tablet computers for local news. What population is that finding applicable to?
b. Another statistic concerned using cell phones or tablet computers to check local weather reports and to find local restaurants. What population is this finding applicable to?
c. Do you think the Pew researchers conducted a census or a sample survey to obtain their results? Why?
d. If you were a restaurant owner, would you find these results interesting? Why? How could you take advantage of this information?
Answer:
a) Population of adults who watch local news
b) Population of adults who use cell phones or tablets.
c) They conducted a sample survey
d) I will find the results interesting.
I as a restaurant owner will also enable a Search Engine Optimization for my website to place my restaurant on the top when local restaurants are searched.
Step-by-step explanation:
a) This finding is applicable to the population of adults who watch local news.
This is because the sample will be collected from the population of adults who watch local news to see the percentage that actually get those local news from their cell phones or tablet computers.
b) This finding is applicable to the population of adults who use cell phones or tablets.
The sample will be collected from the population of adults who use cell phones or tablets. A survey can now be carried out to find out what they use their phones or tablets for, whether to search for restaurants or get weather reports.
c) The Pew Researchers conducted a sample survey because a census data cannot contain the information about weather reports, local restaurants or news channel. Precise information can only be gotten from a sample survey.
d) Yes, I will. Having an idea of how large the population of those that search for local restaurants on phones and tablets will enable me to channel my publicity towards this media. I as a restaurant owner will also enable a Search Engine Optimization for my website to place my restaurant on the top when local restaurants are searched.
The value of homes sold in Hampton VA are normally distributed with a mean of $200,000 and a standard deviation of $10,000. If 1216 houses were sold in 2012 what percentage of houses sold fall between $190,000 and 230,000?
Answer:
84%
Step-by-step explanation:
What we must do is calculate the z value for each value and thus find what percentage each represents and the subtraction would be the percentage between those two values.
We have that z is equal to:
z = (x - m) / (sd)
x is the value to evaluate, m the mean, sd the standard deviation
So for 190000 we have:
z = (190000 - 200000) / (10000)
z = -1
and this value represents 0.1587
for 230000 we have:
z = (230000 - 200000) / (10000)
z = 3
and this value represents 0.9987
we subtract:
0.9987 - 0.1587 = 0.84
Which means that it represents 84% of the houses
What’s the correct answer for this?
Answer:
x = 4
Step-by-step explanation:
Given 2 intersecting chords, then
The product of the parts of one chord is equal to the product of the parts of the other chord, that is
4x = 2 × 8 = 16 ( divide both sides by 4 )
x = 4
The mathematics department at a community college collected data for the number of students enrolled in 40 math classes over the course of one year. The following stem-and-leaf display shows the total number of students enrolled in each class. Choose the statement below that describes the enrollment data. Key: 10|5 denotes 105 students; 7|2 denotes 72 students3 6 6 7 8 9 4 2 3 3 6 6 5 3 3 8 9 6 2 2 3 5 9 7 2 5 7 8 0 0 3 7 7 9 1 3 5 7 10 0 2 5 7 1 1 3 4 12 1 2 2 A. The distribution of the number of students enrolled in each of 40 math courses is skewed to the right, with a typical class size of 69 students. The smallest class size was 36 and the largest was 122. B. The distribution of the number of students enrolled in each of 40 math courses is unimodal and symmetric. The smallest class size was 36 and the largest was 122. The center (as measured by the median) of the distribution was around 73 students. C. The distribution of the number of students enrolled in each of 40 math courses is skewed to the left, with a typical class size of 88 students. The smallest class size was 36 and the largest was 122. D. The distribution of the number of students enrolled in each of 40 math courses is nearly uniform. The smallest class size was 36 and the largest was 122. The center (as measured by the median) of the distribution was around 73 students. E. The distribution of the number of students enrolled in each of 40 math courses is nearly uniform. The smallest class size was 36 and the largest was 122. The center (as measured by the median) of the distribution was around 88 students.
Answer:
D.
Step-by-step explanation:
- Find the length of the side a of the triangle ABC given that <A= 70°,
<B = 50° and b = 4cm.
Answer:
4.91 cm
Step-by-step explanation:
The Law of Sines tells you ...
a/sin(A) = b/sin(B)
a = b(sin(A)/sin(B)) = (4 cm)(sin(70°)/sin(50°))
a ≈ 4.91 cm
Over several years, students of Professor Robin Lock have flipped a large number of coins and recorded whether the flip landed on heads or tails. As reported in a 2002 issue of Chance News, these students has observed 14,709 heads in a total of 29,015 flips.
Required:
a. What are the observational units for this study?
b. Determine the theory-based p-value for testing whether the long-run proportion of heads differs from 0.50.
c. What conclusion would you draw at the 0.05 significance level?
d. Are your results practically important? Why/why not?
Answer:
a) The observational units for this study are coins
b) The test is a two-tailed test.
c) Since the p-value is < α, we can therefore conclude that long-run proportion of heads significantly differ from 0.50
d) The findings are known as statistically important, due to the very large sample size. But the difference between the 0.50 ratio hypothesized and the 0.51 ratio observed isn't very large. Consequently , the findings are not relevant
Step-by-step explanation:
a) The observational units for this study are coins
b) Number of heads = x = 14709
Number of flips = n = 29015
Sample proportion = [tex]\bar{p}[/tex] = x ÷ n = 14709 ÷ 29015=0.51
H[tex]_{o}[/tex] : p =0.50
H[tex]_{a}:[/tex] p [tex]\ne[/tex] 0.50
z = [tex](\bar{p}-p)/\sqrt{p(1-p)/n} = (0.51-0.50)/\sqrt{0.50 \times (1-0.50)/29015}[/tex]
z = 2.366
Using the normal distribution table, area under the normal curve to the right of z;
z = 2.366 = 0.009
The test is a two-tailed test.
Hence, p-value = [tex]0.009 \times 2[/tex] = 0.018
c) α = 0.05
p-value < α = 0.05, we reject the null hypothesis.
We can therefore conclude that long-run proportion of heads significantly differ from 0.50
d) The findings are known as statistically important, due to the very large sample size. But the difference between the 0.50 ratio hypothesized and the 0.51 ratio observed isn't very large. Consequently , the findings are not relevant
Angie and Irene had the same amount of money at first.At a shopping mall, Angie spent $2595 while Irene spent $297.Irene then had thrice as much money as Angie. How much money did Irene have at first?
Answer:
Irene had $3744 at first.
Step-by-step explanation:
Let Angie and Irene had the money initially = $a
At a shopping mall Angie spent money = $2595
Money left with Angie = $(a - 2595)
Similarly, Irene spent the money = $297
Money left with Irene = $(a - 297)
Money left with Irene was thrice as much as Angie,
(a - 297) = 3(a - 2595)
a - 297 = 3a - 7785
3a - a = 7785 - 297
2a = 7488
a = [tex]\frac{7488}{2}[/tex]
a = $3744
Therefore, Irene had $3744 at first.
Answer:
$3746
Step-by-step explanation:
A=2595. I=2595
(x-293)=(x-2595)
X-293=3x-7785
-293+7785=2x
7492/2=x
So. x=3746
The floor manager of the factory earns €45,000 annually. She has a standard rate cut-off point of €28,000 and a tax credit of €4,000. If the standard rate of income tax is 20% and the higher rate is 41%, how much income tax does she have to pay a year?
Answer:
She has to pay income tax of 8,570 Euros
Step-by-step explanation:
On the 28,000 Euros,the floor manager would pay taxes at the rate of 20% which is computed thus:
tax at 20%=28,000 Euros*20%=5,600 Euros
The remaining earnings would be charged to tax at higher tax rate of 41% as follows:
tax at 41%=45,000 Euros-28,000 Euros=17,000 Euros*41%=6,970 Euros
Total amount of taxes=5,600+6970 = 12,570 Euros
Taxes payable =total taxes -tax credit
The manager has a tax credit of 4,000 Euros
taxes payable= 12,570-4,000=8,570 Euros
Find the circumference
Answer:
C = pi or approximately 3.14
Step-by-step explanation:
The circumference is equal to
C = 2 * pi *r
C = 2 * pi *.5
C = pi
We can approximate pi by 3.14
C = pi or approximately 3.14
A grocery stores studies how long it takes customers to get through the speed check lane. They assume that if it takes more than 10 minutes, the customer will be upset. Find the probability that a randomly selected customer takes more than 10 minutes if the average is 7.45 minutes with a standard deviation of 1.52 minutes.
Answer:
4.65% probability that a randomly selected customer takes more than 10 minutes
Step-by-step explanation:
Problems of normally distributed samples are solved using the z-score formula.
In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the zscore of a measure X is given by:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
In this question, we have that:
[tex]\mu = 7.45, \sigma = 1.52[/tex]
Probability that a customer takes more than 10 minutes:
This is 1 subtracted by the pvalue of Z when X = 10. So
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
[tex]Z = \frac{10 - 7.45}{1.52}[/tex]
[tex]Z = 1.68[/tex]
[tex]Z = 1.68[/tex] has a pvalue of 0.9535
1 - 0.9535 = 0.0465
4.65% probability that a randomly selected customer takes more than 10 minutes
What’s the correct answer for this?
Answer:
CO = 15
Step-by-step explanation:
Since it's a right Angled Triangle (because of the tangent) so using Pythagoras theorem
OC² = CW²+OW²
CO²=(9)²+(12)²
CO²=81+144
CO²=225
Taking square root on both sides
CO = 15
The volume of a cone is cubic feet. Its height is 12 feet. Ashlyn is finding the area of the base of the cone. Her work is shown below.
Answer:
Step-by-step explanation:
The volume of a cone of height h and a circular base of radius r is given by [tex]V=\frac{\pi r^2 h }{3}[/tex]. Note that [tex]\pi r^2[/tex] is the area of the base, therefore, if we want to find the area of the base we must multiply the equation by 3 and divide by h. Hence
[tex]\pi r^2 = \frac{3V}{h}[/tex]
In this case, h=12. Given a value of V, we can find the area of the base
4ln(3x)=-4
Solve for x
Answer:
4.4=-4
Step-by-step explanation:
just solving maths
Please answer this correctly without making mistakes
Answer:
i think its da second image!!!
Step-by-step explanation:
happy to help ya!
KLA=120x KLM=168x ALM=48. Find x
Answer:
Step-by-st
respond poorfa
Answer:
180-168=12
12+48=60x
Step-by-step explanation:
Please answer this correctly
Answer:
9 5/7
Step-by-step explanation:
You add all the 13/14 then divided it by 14
Then add all the while numbers then add then add them all together
What is fo)?
O O only
0 -6 only
0-2, 1, 1, and 3 only
0 -6, -2, 1, 1, and 3 only
Answer:
-6 only
Step-by-step explanation:
f(0) is the value of y when x=0. This is the graph of a 4th-degree polynomial, so is a function. There is only one y-value for x=0. That is where the graph crosses the y-axis, at y = -6.
f(0) = -6 . . . . only
If a circle was cut into 8 equal pieces, what fraction of the circle would be each piece?
Answer:
1/8
Step-by-step explanation:
there are 8 pieces therefore the numerator would be 1 and the denominator 8.
A national college researcher reported that 65% of students who graduated from high school in 2012 enrolled in college. Twenty nine high school graduates are sampled. Round the answers to four decimal places.
(a) What is the probability that exactly 17 of them enroll in college? The probability that exactly 17 of them enroll in college is_______
(b) What is the probability that more than 14 enroll in college? The probability that more than 14 enroll in college is_______ .
(c) What is the probability that fewer than 11 enroll in college? The probability that fewer than 11 enroll in college is_______ .
(d) Would it be unusual if more than 24 of them enroll in college? It (Choose one) be unusual if more than 24 of them enroll in college since the probability is ________.
Answer:
a) The probability that exactly 17 of them enroll in college is 0.116.
b) The probability that more than 14 enroll in college is 0.995.
c) The probability that fewer than 11 enroll in college is 0.001.
d) It would be be unusual if more than 24 of them enroll in college since the probability is 0.009.
Step-by-step explanation:
We can model this with a binomial distribution, with n=29 and p=0.65.
The probability that k students from the sample who graduated from high school in 2012 enrolled in college is:
[tex]P(x=k) = \dbinom{n}{k} p^{k}(1-p)^{n-k}\\\\\\P(x=k) = \dbinom{29}{k} 0.65^{k} 0.35^{29-k}\\\\\\[/tex]
a) The probability that exactly 17 of them enroll in college is:
[tex]P(x=17) = \dbinom{29}{17} p^{17}(1-p)^{12}=51895935*0.0007*0=0.116\\\\\\[/tex]
b) The probability that more than 14 of them enroll in college is:
[tex]P(X>14)=\sum_{15}^{29} P(X=k_i)=1-\sum_{0}^{14} P(X=k_i)\\\\\\P(x=0)=0\\\\P(x=1)=0\\\\P(x=2)=0\\\\P(x=3)=0\\\\P(x=4)=0\\\\P(x=5)=0\\\\P(x=6)=0\\\\P(x=7)=0\\\\P(x=8)=0\\\\P(x=9)=0\\\\P(x=10)=0.001\\\\P(x=11)=0.002\\\\P(x=12)=0.005\\\\P(x=13)=0.013\\\\P(x=14)=0.027\\\\\\P(X>14)=1-0.005=0.995[/tex]
c) Using the probabilities calculated in the point b, we have:
[tex]P(X<11)=\sum_0^{10}P(X=k_i)\approx0.001[/tex]
d) The probabilities that more than 24 enroll in college is:
[tex]P(X>24)=\sum_{25}^{29}P(X=k_i)\\\\\\ P(x=25) = \dbinom{29}{25} p^{25}(1-p)^{4}=23751*0*0.015=0.007\\\\\\P(x=26) = \dbinom{29}{26} p^{26}(1-p)^{3}=3654*0*0.043=0.002\\\\\\P(x=27) = \dbinom{29}{27} p^{27}(1-p)^{2}=406*0*0.123=0\\\\\\P(x=28) = \dbinom{29}{28} p^{28}(1-p)^{1}=29*0*0.35=0\\\\\\P(x=29) = \dbinom{29}{29} p^{29}(1-p)^{0}=1*0*1=0\\\\\\\\P(X>24)=0.007+0.002+0+0+0=0.009[/tex]