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A Sample of Charge Accounts at a Local Drug Store

question 84

Essay

A sample of charge accounts at a local drug store revealed the following frequency distribution of unpaid balances.  Unpaid Balance  Frequency 1029130496506997089119010913\begin{array} { l c } \text { Unpaid Balance } & \text { Frequency } \\10 - 29 & 1 \\30 - 49 & 6 \\50 - 69 & 9 \\70 - 89 & 11 \\90 - 109 & 13\end{array}
a.
Determine the mean unpaid balance.
b.
Determine the variance.
c.
Determine the standard deviation.
d.
Compute the coefficient of variation.


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