Asked by Beth

Suppose that hours of sleep per night for single adults between 30 and 40 years of age are normally distributed with a mean of 6.7 hours and a standard deviation of 1.1 hours. What proportion of adults sleep longer than 4.5 hours per night? (Report to 3 decimal places.)

Answers

Answered by Damon
http://davidmlane.com/hyperstat/z_table.html
Answered by Elizabeth
7.54
Answered by Naresh
0.977
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