Answer:
0.998 is the probability that the average money spent by a sample of 40 shoppers is within $10 of the actual population mean.
Step-by-step explanation:
We are given the following information in the question:
Standard Deviation, σ = $21.51
We are given that the distribution of average money spend is a bell shaped distribution that is a normal distribution.
Formula:

We have to find:
P( average money spent is within $10 of the actual population mean.)

Calculation the value from standard normal z table, we have,

Input value= number of hours babysat, output value= how much money you get.
Just take both sides multiply by 2 then divide 3
Answer:
80% (you divide 4 by 5 to get 0.8, then you move the decimal 2 spaces to the right
Question 5, x could be either 6 or -1.