1. The average age of vehicles registered in the United States is 96 months. Assume the population...
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1. The average age of vehicles registered in the United States is 96 months. Assume the population is normally distributed with a standard deviation of 15 months. Find the probability that the average age of a sample of 36 vehicles is between 98 and 100 months?
a. 6.4%
b. 28.8%
c. 44.5
d. 15.7%
2. If a normally distributed group of test scores have a mean of 70 and a standard deviation of 12. Find the percentage of scores that will fall below a 50.
a. 4.75%
b. 6.75%
c. 35.54%
d. 45.25%
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Related Book For
Essentials Of Business Statistics Communicating With Numbers
ISBN: 9780078020544
1st Edition
Authors: Sanjiv Jaggia, Alison Kelly
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