Suppose that the amount of time that takes place for the Bureau of Internal Revenue(BIR) to send refunds to taxpayers is normally distributed with a mean of 14 weeks and a standard deviation  of 4 weeks. a. What proportion of taxpayers should get a refund within 8 weeks? b. How long will it take before 70% of taxpayers get their refund

A First Course in Probability (10th Edition)
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Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Suppose that the amount of time that takes place for the Bureau of Internal Revenue(BIR) to send refunds to taxpayers is normally distributed with a mean of 14 weeks and a standard deviation  of 4 weeks.

a. What proportion of taxpayers should get a refund within 8 weeks?

b. How long will it take before 70% of taxpayers get their refund?

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