The switchboard in a Minneapolis law office gets an average of 5.5 incoming phone calls during the noon hour on Mondays. Experience shows that the existing staff can handle up to six calls in an hour. Let X = the number of calls received at noon. What is the standard deviation of X?

Standard deviation of X = 2.3452 calls

Step-by-step explanation:

This is a Poisson distribution problem with an average (μ) of 5.5 number of incoming calls during the noon hour on Mondays.

Therefore, the standard deviation for the number of calls received, X, is represented by:

a. σ = √µ

Thus;

X ~ P(5.5); µ = 5.5; σ = √5.5 ≈ 2.3452 calls

how is that middle school

step-by-step explanation:

15%

step-by-step explanation:

use the table and count the number of guesses that has two correct answers.

the following are two correct answers

10010, 01100, 11000

a total of 3 numbers having 2 correct guesses out of 20 questions.

probability of getting 2 correct guesses = the number of questions getting 2 correct answers / total number of questions.

= 3/20

to convert it into percent multiply by 100, we get

= 3/20 * 100

= 15%

the answer is 15%

you.