please help me I will give brainliest ​

The probability that a randomly selected student studies more than 27 hours per week is 0.0014.

In statistics, Standard deviation is a measure of the variation of a set of values.

σ = standard deviation of a population

N = number of observations of population

X = mean

μ = population mean

The average number of hours that NAU students spend studying each week is normally distributed with a mean of 25 hours and a standard deviation of 2.5 hours.

So, μ = 25

σ  = 2.5 hours.

[tex]P(X > 27) = P(\frac{x-\mu}{\sigma} } > \frac{27-25}{2.5})\\\\= P(z } > \frac{27-25}{2.5})\\\\[/tex]

= P (z > 1.2)

= 1 -  P (z < 1.2)

= 0.0014

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Answer:

D

Step-by-step explanation:

[tex] \frac{3}{10} = 0.3[/tex]

[tex] \frac{1}{3} = 0.333333333[/tex]

[tex]0.333 = 0.333[/tex]

[tex]33\% = 0.33[/tex]

[tex]0.3 < 0.33 < 0.333 < 0.333333333[/tex]

Answer:

1/10

Step-by-step explanation:

Answer:

≈4.24x

Step-by-step explanation:

[tex]\sqrt{18} = 4.24[/tex]

Have a nice day! :)

Answer:

18x

Step-by-step explanation:

because itś squared, and the area of a square is always squared, its 18x

Answer:

3

Step-by-step explanation:

2(x + 1) = 3(5 - x) + 2

Distribute,

2(x + 1) = 3(5 - x) + 2

2x + 2 = 3(5 - x) + 2

Rearrange terms,

2x + 2 = 3(5 - x) + 2

2x + 2 = 3(-x + 5) + 2

Distribute,

2x + 2 = 3(-x + 5) + 2

2x + 2 = -3x + 15 + 2

Add the numbers,

2x + 2 = -3x + 15 + 2

2x + 2 = -3x + 17

Subtract 2 from both sides,

2x + 2 = -3x + 17

2x + 2 - 2 = -3x + 17 - 2

2x  = -3x + 17 - 2

2x  = -3x + 15

Add 3x to both sides,

2x  = -3x + 15

2x + 3x  = -3x + 3x + 15

5x  = -3x + 3x + 15

5x  =  15

Divide both sides by the same factor (15),

5x  =  15

5x/5 = 15/5

x = 15/5

x = 3

Hence, the answer is 3.

Answer:

2/7 + 7/14 = 11/14

Step-by-step explanation:

7 x -2 = -14 Each seventh is going to be worth 2 fourteenths!

This means 2/7 = 4/14

4/14 + 7/14 = 11/14

Answer:

eleven fourteenths

Step-by-step explanation:

An expression that gives the degree of the polynomial is [tex]\rm ax^2+bx+c=0[/tex].

An irreducible quadratic factor is an irreducible factor that is quadratic or has the highest exponent of 2.

An irreducible quadratic factor is an irreducible factor that is quadratic or has the highest exponent of 2.

A nonlinear equation is one in which the maximum degree of a term is two or more than two. When the polynomial equation is with degree two, then it is called a quadratic equation, and it is represented by a standard expression;

[tex]\rm ax^2+bx+c=0[/tex]

Where a is not equal to 0.

The degree of the polynomial is 2.

A quadratic polynomial can be further divided into linear factors. Now, simplify one of the quadratic expressions by completing the square method, which gives two linear factors.

Hence, an expression that gives the degree of the polynomial is [tex]\rm ax^2+bx+c=0[/tex].

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Answer: 121.0

Step-by-step explanation:

Step-by-step explanation:

[tex]Another example , when a straight wire is moved up and down rapidly between the two poles of a horseshoe magnet , then an electric current is produced in the wire. This is also an example of electromagnetic induction .

Goblin Birt can take 15 minutes to count the coins in the bag by himself.

The unitary method is a process for solving a problem by first finding the value of a unit, and then finding the necessary value by multiplying the single unit value.

How to calculate how long would it take goblin Birt to count the coins in the bag by himself?

In this problem, the unitary method is to be applied three times.

Here, counting all the coins is considered as the entire work which is considered as 1.

According to the problem,

Goblin guys can count the coins in a bag in 10 minutes.

In 10 minutes Goblin guys can count the coins in the bag.

In 1-minute Goblin, guys can count th part of the coins in the bag.

Again, according to the problem,

Goblin gryh and Goblin Birt both can count all the coins in 6 minutes.

In 6 minutes, Goblin gryh and Goblin Birt both can count all the coins in the bag

In 1 minute, Goblin gryh and goblin Birt both can count  th  part of the coins in the bag.

In 1 minute, Goblin Birt can count ([tex]\dfrac{1}{6}-\dfrac{1}{10}[/tex]  th part of the coins in the bag.

[tex]= (\dfrac{5-3}{30})=\dfrac{1}{15}[/tex] th part of the coins.

We can say, Goblin Birt, can count 1 / 15 th part of the coins in the bag in 1 minute. Goblin Birt himself can count all the coins in the bag in 15 minutes.

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The mean of the number of pets which Spencer has surveyed for five of his friends is number 3.

The mean of the data is the average value of the given data. The mean of the data is the ratio of sum of all the values of data to the total number of values of data.

Spencer has surveyed five of his friends to known that how many pets they have.

His results are shown in the table below.  Cody has 1 Lara has 4 Sam has 5 Ella has 3 Maria has 2. There are total 5 friends. Thus the mean number of pets is:

[tex]\text{Mean}=\dfrac{1+4+5+3+2}{5}\\\text{Mean}=\dfrac{15}{5}\\\text{Mean}=3[/tex]

Thus, the mean of the number of pets which Spencer has surveyed for five of his friends is number 3.

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Answer:

The perimeter of this isosceles trapazoid is 49

Step-by-step explanation:

P = 11 + 14 + 2(12)

Answer: P(sum is 5 or lower) = 10/36 (not simplified) = 5/18 (simplified)

Step-by-step explanation: The event is {(1,1), (1,2), (1,3), (1,4), (2,1), (2,2), (2,3), (3,1), (3,2), (4,1)}

Answer: 1

Step-by-step explanation:

Answer: f(y) x g(y) = 1

Step-by-step explanation:

[tex]\frac{2y^3-y^2+2y-1}{y^3-y^2+y-1}\cdot \frac{2y^2-3y+1}{4y^2-4y+1}\\\\= \frac{4y^5-8y^4+9y^3-9y^2+5y-1}{4y^5-8y^4+9y^3-9y^2+5y-1} \\\\= \frac{(y-1)(2y-1)(2y-1)(y^2+1)}{(y-1)(2y-1)(2y-1)(y^2+1)} \\\\= 1[/tex]

Answer:

C.

Step-by-step explanation:

10^2=100

100 shifts the decimal point 2 places to the right

Answer:

pickup b

Step-by-step explanation:

Unit conversion :

1 kilogram is about 2.20462262 pounds

Solving :

⇒ Let's convert pickup b's mass into pounds

⇒ mass (pickup b) = 685 × 2.20462262

⇒ mass (pickup b) = 1510 pounds (approximately)

Clearly :

⇒ 1500 < 1510

⇒ mass (pickup a) < mass (pickup b)

Hence, pickup b weighs more.

Answer:

5000 multiplied by 0.05 multiplied by 4

Step-by-step explanation:

you should get 1000. :D next you add 1000 to the orginal 5000 to get 6000!

Answer:

10 lbs

Step-by-step explanation:

25 is to 5    as   x is to 2

25/5 = x/2

2 * 25/5 = x = 10 lbs

The statements which are correct include the following:

The table given shows that:

This therefore results in the conclusion that option 1,3 and 4 are

the most appropriate options.

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Answer:

x = 3, y = 3

Step-by-step explanation:

x = -5x -18

5x + 18 = -x

6x + 18 = 0

6x = 18

x = 3

Answer:

5/6

Step-by-step explanation:

The factors of 24 that are on a die are: 1,2,3,4 and 6. This only leaves 5 that isn't a factor of 24. Therefore, since there are 5 possibilities out of the 6 total numbers, the probability of rolling factors of 24 is 5/6.

Answer:

[tex]12x - 3y = 6[/tex]

Step-by-step explanation:

Standard form is written this way: [tex]Ax+By=C[/tex]

However, in this case, we just have to simplify 8x-3y=6-4x, as it is already mostly in standard form.

So, to do this, we have to combine like terms.

The only like terms that can be combined are -4x and 8x.

So, we add 4x to both sides, and we get: [tex]12x - 3y = 6[/tex].

Answer:

the vertex represents a maximum

Vertex is (4,7)

f(x)=-(x-4)^2+7

Step-by-step explanation:

Given the function [tex]f(x)=-x^2+8x+9[/tex]

Equation is in the form of y=ax^2+bx+c

[tex]a=-1[/tex]

When 'a' is negative, then vertex is maximum

when 'a' is positive, then vertex is minimum

[tex]a=-1[/tex] is negative, so the vertex represents a maximum

[tex]f(x)=-x^2+8x+9[/tex], factor out negative

Take out negative sign in common

Answer:

pls refer to given attachemnt

Answer: Heyaa!~

Your Answer is... 15/2 in its exact form!

Step-by-step explanation:

Reduce the expression, if possible, by cancelling the common factors.

Hopefully this helps you! ~

Answer:

the answer is 80

Step-by-step explanation:

QR=ST: 7x+3=5x+25

2x=22

x=11

7(11)+3=80      5(11)+25=80

The algebraic expression of a polynomial with a degree of 4 is 9x⁴ – x³ – x/5

For a polynomial to have a degree of 4, the following must be true:

Using the above highlight, the algebraic expression of a polynomial with a degree of 4 is 9x⁴ – x³ – x/5

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