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. . .
reported coefficient of variation is 2.7%. Use this
information to determine the standard deviation of
the annual number of visits to physicians made by
places.)
0.0756
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What are the big corporations doing with their
wealth? One way to answer this question is to
examine profits as percentage of assets. A random
sample of 50 Fortune 500 companies gave the
following information. Estimate the sample mean,
sample variance, and sample standard deviation
for profit as percentage of assets. (Round your
Profit as percentage of assets 8.6-12.5 12.6-16.5 16.6-20.5 20.6-24.5 24.6-28.5
Number of companies
15
16
x 14.803
2 23.39
8 4.84
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Alexander Borbely is a professor at the University
of Zurich Medical School, where he is director of
the sleep laboratory. The histogram in the figure
below is based on information from his book
Secrets of Sleep. The histogram displays hours of
sleep per day for a random sample of 200
subjects. Estimate the mean hours of sleep,
standard deviation of hours of sleep and

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