Annual entertainment expenses in a population of 100 families have a mean of $2040 and a standard deviation of $360. (a) Find the mean and standard deviation of monthly expenses.
(b) What is the total amount of monthly entertainment expenses for this population?

The correct answer is:

(a) Mean = 170,

    Standard deviation = 30

(b) 1700

Step-by-step explanation:

Given:

(a)

Mean of monthly expenses will be:

=

=

=

Standard deviation will be:

=

=

=

(b)

The total amount of monthly expenses will be:

=

=

=

345

step-by-step explanation:

answer: do we write it

step-by-step explanation: