Question: Refer to Exercise 2.27 and the data on the consumer price index for various cities. Find the increase, for each city, by subtracting the 2007

Refer to Exercise 2.27 and the data on the consumer price index for various cities. Find the increase, for each city, by subtracting the 2007 value from the 2011 value.
(a) Find the sample mean and standard deviation of these differences.
(b) What proportion of the increases lie between ± 25?

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