chap6

1

The average income tax refund for the 2009 tax year was

$2980.

Assume the refund per person follows the normal probability distribution with a standard deviation of

$951.

Complete parts a through d below.

Question content area bottom

Part 1

a. What is the probability that a randomly selected tax return refund will be more than

$2200?

enter your response here

(Round to four decimal places as needed.)

2

A study discovered that Americans consumed an average of

12.5

pounds of chocolate per year. Assume that the annual chocolate consumption follows the normal distribution with a standard deviation of

3.1

pounds. Complete parts a through e below.

Question content area bottom

Part 1

a. What is the probability that an American will consume less than

9

pounds of chocolate next year?

enter your response here

(Round to four decimal places as needed.)

3