MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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Use the Empirical Rule (68-95-99.7) to answer the question.

The interest rate for the financing of a used car is on average 9% with a standard deviation of 3%.  Assuming that interest rates for used car loans are normally distributed, approximately what percent of loans have an interest rate that is between 3% and 15%

I see the answer to this question is (6,12), so the solution is 68%. I am not sure why (6,12) brings upon the answer 68%. Thank you.

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