Monthly stock prices (in $) for Corporation A and Corporation B are collected for five years. A portion of the data is shown in the accompanying table.

a. Calculate the mean and the standard deviation for each corporation’s stock price. 

b. Which corporation had the higher average stock price over the time period? Which corporation’s stock price had greater dispersion as measured by the standard deviation?

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Date 1/1/2014 2/1/2014 A А B 47.95 65.59 52.95 65.61 ⠀ 12/1/2018 66.09 66.09 ⠀ 92.64