Question

X

Answer 1

Using the mean concept, it is found that the mean difference between the call times and the  company's average call time is given by:

• C. 0.4

What is the mean?

• The mean of a data-set is given by the sum of all observations in the data-set divided by the number of observations.

In this problem:

• The four observations are the differences between the time of each phone call and the average time.

• They are: {-2.32, -1.55, 4.79, 0.68}

Hence, the mean difference is:

$M = \frac{-2.32 - 1.55 + 4.79 + 0.68}{4} = 0.4$

Hence, option C is correct.

To learn more about the mean concept, you can take a look at brainly.com/question/13451786