Please helpppppppppppppppppppppppppp<br><br><br> show your work<br><br><br> -25 x 25

A new phone system was installed last year to help reduce the expense of personal calls that were being made by employees. Befor

Leya [2.2K]

Using the normal distribution, it is found that there was a 0.9579 = 95.79% probability of a month having a PCE between $575 and $790.

<h3>Normal Probability Distribution</h3>

The z-score of a measure X of a normally distributed variable with mean $\mu$ and standard deviation $\sigma$ is given by:

$Z = \frac{X - \mu}{\sigma}$

The z-score measures how many standard deviations the measure is above or below the mean.

Looking at the z-score table, the p-value associated with this z-score is found, which is the percentile of X.

The mean and the standard deviation are given, respectively, by:

$\mu = 700, \sigma = 50$ .

The probability of a month having a PCE between $575 and $790 is the <u>p-value of Z when X = 790 subtracted by the p-value of Z when X = 575</u>, hence:

X = 790:

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{790 - 700}{50}$

Z = 1.8

Z = 1.8 has a p-value of 0.9641.

X = 575:

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{575 - 700}{50}$

Z = -2.5

Z = -2.5 has a p-value of 0.0062.

0.9641 - 0.0062 = 0.9579.

0.9579 = 95.79% probability of a month having a PCE between $575 and $790.

More can be learned about the normal distribution at brainly.com/question/4079902

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3 0

2 years ago

Members of a soccer team raised $1946.50 to go to a tournament. They rented a bus

son4ous [18]

Answer:

d

Step-by-step explanation:

d

7 0

3 years ago

Read 2 more answers

PLEASE HELP! Solve the system of equations by graphing on your own paper. What is the x-coordinate of the solution?

raketka [301]

Answer:

x = 4

Step-by-step explanation:

steps are in the pic above.

5 0

3 years ago

What is the slope of this line? y = -3/4 x + 7/8

Alexeev081 [22]

I am sorry I can help more but
Google can graph lines if that helps

You just look up graph of a line with your numbers

7 0

4 years ago

Express the polynomial z^2 − z^4 + 2z^2 in standard form and then classify it.quadratic trinomialcubic trinomialquartic binomial

pantera1 [17]

Given:

There are given that the polynomial:

$z^2-z^4+2z^2$

Explanation:

According to the concept, trinomial is three terms, and binomial means two terms.

And,

When the degree of any polynomial is 2, then it represents quadratic, when the degree is 3, it represents cubic, when the degree is 4, then it represents quartic, and when the degree is 5, then it represents quintic.

Now,

From the equation:

$z^{2}-z^{4}+2z^{2}=3z^{3}-z^{4}$

In the above equation, there are only two parts and they have degree 4.

So, the given terms represent quartic binomial.

Final answer:

Hence, the correct option is C.

5 0

2 years ago

Please helpppppppppppppppppppppppppp show your work -25 x 25