A population is normally distributed with a mean of 15.1 and a standard deviation of 1.4. A sample of size 21 is taken from the population. What is the the standard deviation of the sampling distribution?

Round to the nearest thousandth.

Tamara’s monthly cash inflow be $624 .

Option (b) is correct .

Step-by-step explanation:

Tamara earns $8 an hour at her job working 25 hours per week.

Total earning per week = 8 × Number of hours

                                       = 8 × 25

                                       = $200

If 22% of her paycheck goes to taxes .

22% is written in the decimal form.

= 0.22

Pay check goes to taxes = 200 × 0.22

                                         = $ 44

Thus

Tamara’s cash flow per week = Total earnings per week - Taxes cost

                                                 = 200 - 44

                                                 = $156

As 1 month contains four months .

Tamara’s monthly cash inflow  = $156 × 4

                                                   = $ 624

Therefore the Tamara’s monthly cash inflow be $624 .

Option (b) is correct .