Question: The Data and Story Library website (a website devoted to applications of statistics) gives a histogram of the ages of a sample of 60 CEOs.

The Data and Story Library website (a website devoted to applications of statistics) gives a histogram of the ages of a sample of 60 CEOs. We present the data in the form of a frequency distribution below.
Age (Years)Frequency
28-32...................................1
33-37...................................3
38-42...................................3
43-47.................................13
48-52.................................14
53-57.................................12
58-62..................................9
63-67..................................1
68-72..................................3
73-77..................................1
Calculate the (approximate) sample mean, variance, and standard deviation of these data.

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