Show that, analogous to the formula of Exercise 8.17, the formula for the sample variance can be

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Show that, analogous to the formula of Exercise 8.17, the formula for the sample variance can be written as
ΣΗ nx s =

Also, use this formula to calculate the variance of the following sample data on the number of service calls received by a tow truck operator on eight consecutive working days: 13, 14, 13, 11, 15, 14, 17, and 11.

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