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19. The Internal Revenue Service reported the average refund in 2017 was $2,878 with a standard deviation of $520. Assume the amount refunded is normally distributed. a. What percent of the refunds are more than $3,500? b. What percent of the refunds are more than $3,500 but less than $4,000? c. What percent of the refunds are more than $2,400 but less than $4,000?

19. The Internal Revenue Service reported the average refund in 2017 was $2,878 with a standard deviation of $520. Assume the amount refunded is normally distributed. a. What percent of the refunds are more than $3,500? b. What percent of the refunds are more than $3,500 but less than $4,000? c. What percent of the refunds are more than $2,400 but less than $4,000?

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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19. The Internal Revenue Service reported the average refund in 2017 was $2,878 with a standard deviation of $520. Assume the amount refunded is normally distributed. a. What percent of the refunds are more than $3,500? b. What percent of the refunds are more than $3,500 but less than $4,000? c. What percent of the refunds are more than $2,400 but less than $4,000?
Transcribed Image Text:19. The Internal Revenue Service reported the average refund in 2017 was $2,878 with a standard deviation of $520. Assume the amount refunded is normally distributed. a. What percent of the refunds are more than $3,500? b. What percent of the refunds are more than $3,500 but less than $4,000? c. What percent of the refunds are more than $2,400 but less than $4,000?
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