The Internal Revenue Service reported the average refund in 2017 was $2,878 with a standard deviation of
Question:
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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Step by Step Answer:
Given X follows Normal distribution with 2878 and 520 ...View the full answer
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Related Book For 
Statistical Techniques In Business And Economics
ISBN: 9781260239478
18th Edition
Authors: Douglas Lind, William Marchal, Samuel Wathen
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