Answer:
1.8
General Formulas and Concepts:
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightStep-by-step explanation:
Step 1: Define
2.8 - 4 ÷ 4
Step 2: Evaluate
Division: 2.8 - 1Subtraction: 1.8Researchers make a one-sample zzz interval to estimate the proportion of adults who would say they learned something new in the past month. Previous studies have suggested that about 40\%40%40, percent would answer "yes" to this question. The researchers plan on using a confidence level of 95\%95%95, percent, and they want the margin of error to be no more than \pm 5\%±5%plus minus, 5, percent.
Answer:
369
Step-by-step explanation:
The researchers need a sample size of 385 to estimate the proportion of adults who would say they learned something new in the past month with a 95% confidence level and a margin of error of no more than ±5%.
What is a margin of error?The margin of error is the amount of error or uncertainty in a statistical estimate, usually an estimate of a population parameter based on a sample.
We have,
To create a one-sample z-interval, the following steps can be followed:
Determine the sample size (n) and the sample proportion p.
Since no sample size or proportion is given in the problem, we cannot proceed with this step.
Determine the level of confidence (C) for the interval. In this case, the researchers want a confidence level of 95%, so C = 0.95.
Find the critical value (z*) for the level of confidence.
This can be done using a standard normal distribution table or a calculator.
For a 95% confidence level, the critical value is 1.96.
Calculate the margin of error (ME) using the formula:
ME = z x √(p x (1 - p) / n)
Since the margin of error is given as no more than ±5%, we can set it equal to 0.05 and solve for the required sample size:
0.05 = 1.96 x √(0.4 x (1 - 0.4) / n)
Solving for n, we get:
n = (1.96 / 0.05)² x 0.4 x (1 - 0.4)
n ≈ 384.16
Since the sample size must be a whole number, we round up to the nearest integer and get n = 385.
Therefore,
The researchers need a sample size of 385 to estimate the proportion of adults who would say they learned something new in the past month with a 95% confidence level and a margin of error of no more than ±5%.
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A group of friends wants to go to the amusement park. They have no more than $325 to spend on parking and admission. Parking is $13.50, and tickets cost $21.25 per
person, including tax. Which inequality can be used to determine x, the maximum number of people who can go to the amusement park?
Answer:
14
Step-by-step explanation:
First you do 325 - 13.50 , then you just divide 311.50 by 21.25, and because you cant have .6 of a friend its 14 :)
Solve for y.
What is the root? If there is none, choose none.
y = 4
y = 5
none
Answer:
y = 5
Step-by-step explanation:
if y = 5 then
(√10-1) -1 = 2
3 - 1 = 2
true
Answer:
y = 5
Step-by-step explanation:
I really need help answer a statistical question, can someone please help me
Answer:
C.
Step-by-step explanation:
A statiscal experiment can be repeated multiple times and is usually random. The number of accidents on the street are random each year, and by comparing them to last year's, it always be random.
What is the arc length from 0 to 40 degrees if the radius of the circle is 18 inches long?
Answer:
Step-by-step explanation:
Circumference of circle = 2π18 = 36π inches.
40° is 1/9 of a circle. Arc length = 1/9 of circumference = 4π inches.
need help with number 4
Answer:
Perimeter=18; Area= 18
Step-by-step explanation:
For perimeter, the vertical sides are 3 and the Horizontal sides are 6. So 6+6+3+3= 18
For area, the vertical side is 3 and the Horizontal side is 6, this 6*3=18
classify the segment in each part below. only use the information given in the figure do not assume measures are equal unless the markings indicate they are
Answer:
i dont know i just need points for more questions sorry
Step-by-step explanation:
Find the sum of the finite geometric sequence whose first term is 1.4, whose ratio is 0.5, and which has six terms.
The sum is
(Type an integer or decimal rounded to five decimal places as needed.)
Answer:
2.75632 rounded to 5 decimal places
Step-by-step explanation:
a(r^n-1)/r-1 is the formula for sum of geometric series
where a= first term (1.4)
n= number of terms(6)
r= common ratio(0.5)
The data in the line plot show how many pages each student read last night. Which is the best measure of variability?
A. interquartile range
B. mean
C. median
D. range
What is the 100th term in the sequence 5,9,13,17,21
Answer:
13
Step-by-step explanation:
it is on 100th place so 100th term is 13
Answer:
401
Step-by-step explanation:
arithmetic sequence formula: an=a1+d(n-1)
n= term # you're looking for
d= common difference
a1= 1st term in sequence
a100=5+4(100-1)
5+4(99)
5+396
a100=401
help me help me help me help me
How many eights make a half
Answer:
Four, because 4/8 = 1/2 There are obviously 8 1/8ths in a whole so half of that amount is obviously 4 1/8ths.
Step-by-step explanation:
Gave above.
Please help due tomorrow please explain if can
31% of U.S. adults say they are more likely to make purchases during a sales tax holiday. You randomly select 10 adults. Find the probability that the number of adults who say they are more likely to make purchases during a sales tax holiday is (a) exactly two, (b) more than two, and (c) between two and five, inclusive.
Answer:
a) 0.222
b) 0.643
c) 0.811
Step-by-step explanation:
Please help me solve
Answer:
s= -2
Step-by-step explanation:
The square fountain has an area of 164 meters squared. What is the
length of each side?
Mai bank account is overdrawn by $125 which means her balance is negative 125 she gets $85 for her birthday and deposit into her account how much does she have in her bank
Assume that a fair die is rolled. The sample space is {1, 2, 3, 4, 5, 6) and all outcomes
are equally likely. P(less than 5)
What is the value of x in the equation -5.4 = 4x - 1.8 ?
Answer:
0.9
Step-by-step explanation:
3.
Select all the true statements.
A
-6.1 +-7.8 is positive.
B.
-3.2--19) is positive.
C.
12+(-3.5) is negative.
D.
4+-4 is equal to zero.
E.
82 - (-28) is negative.
Answer:
B & D
Step-by-step explanation:
B & D
In the ordered pair of numbers (-2,8) the number - 2 is called the
and the number 8 is called the
Answer:
x co-ordinate and y co-ordinate
Joe has four birthday cakes to share between his 24 guests joe doesn't eat cake , but wants to cut them up so that each guest gets an equal piece what fraction is each piece of cake
The fraction of each piece of a cake is 1/6.
Given that, Joe has four birthday cakes to share with his 24 guests joe doesn't eat cake.
We need to find what fraction is each piece of cake.
What are fractions?A fraction represents a part of a whole or, more generally, any number of equal parts. In arithmetic, the number is expressed as a quotient, in which the numerator is divided by the denominator. In a simple fraction, both are integers. A complex fraction has a fraction in the numerator or denominator. In a proper fraction, the numerator is less than the denominator.
Now, 4 cakes are shared among 24 guests.
So, 24/4=6
Thus, each cake needs to divide into 6 slices.
Therefore, the fraction of each piece of a cake is 1/6.
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If a circle has a circumference of 4.6pi what is the area?
Answer:
r = 0.732 d = 1.46 C = 4.6
Step-by-step explanation:
Answer:
16.62
Step-by-step explanation:
formula for area of a circle is [tex]\pi r^{2}[/tex] 4.6 is the diameter and radius is 1/2 of diameter so [tex]\pi 2.3^{2}[/tex] is the equation
need help quick please
Answer:dont lnow sorry. Only if u give me robux
Step-by-step explanation:
Answer: the answer for x is ( x = 2 (y+8) a the
answer for y = x-16\2
How many students were over 145
HELPPPPPPPPPPPPPPPPPP
Which mechanical waves need a medium to travel through?
Question 3 options:
electromagnetic waves only
mechanical waves do not require a medium to travel through
transverse and surface waves
all mechanical waves need a medium
surface waves only
Answer: transverse and surface waves
Step-by-step explanation:
Maggie wants to know how many students in her school enjoy watching sports on TV. She asks all 25 students in her math class and finds that 60% of
her classmates enjoy watching sports on TV. She claims that 60% of the school's student population would be expected to enjoy watching sports on TV. Is
Maggie making a valid inference about her population?
O Yes, it is a valid inference because she asked all 25 students in her math class
O Yes, it is a valid inference because her classmates make up random sample of the students in the school
O No. it is not a valid inference because her classmates do not make up a random sample of the students in the school
O No, it is not a valid inference because she asked all 25 students in her math class instead of taking a sample from her geography class
Answer:
yes it is valid influence because he asked all 25 student in her math class
I dont understand what the question is asking me
Answer:
[tex]\huge\boxed{\sf <E = 40\°}[/tex]
Step-by-step explanation:
∠E = 1/2 (mCD - mAB)
Where mCD = 110° and mAB = 30°
∠E = 1/2 (110° - 30°)
∠E = 1/2 (80°)
∠E = 40°
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807What is the height of the triangle with an area of 64 square feet and a base of 8 feet?
Answer:
8
Step-by-step explanation:
8*8 = 64
b*h = a
Which story represents the equation 7 ÷ one fourth = 28? please help
Luke has 7 granola bars and wants to divide them equally to share with his friends. He wants to give each friend 4 granola bars. How many of Luke's friends will get granola?
A. Mario ordered 7 pizzas and wants to divide the pieces equally on plates. He wants to put one fourth of a pizza on each plate. How many plates will Mario need in all?
B.Taylor has 4 bags of candy to divide equally with her friends. She wants to give each friend one seventh of a bag of candy. How many of Taylor's friends will get candy?
C.Lucky has one fourth of a box of brownies and wants to divide it equally among 7 family members. What fraction of the brownies will each family member receive?
Answer:
b
Step-by-step explanation:
Answer:
Mario ordered 7 pizzas and wants to divide the pieces equally on plates. He wants to put one fourth of a pizza on each plate. How many plates will Mario need in all?
Step-by-step explanation: