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. EipictureClick here for the Excel Data File a-1. Calculate the mean and the standard deviation for Corporation A. (Round final answers to 2 decimal places.) a-2. Calculate the mean and the standard deviation for Corporation B. (Round final answers to 2 decimal places.) 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? \begin{tabular}{|r|r|r|r|} \hline 46 & 9/1/17 & 53.36 & 52.35 \\ \hline 47 & 10/1/17 & 58.66 & 52.89 \\ \hline 48 & 11/1/17 & 58.35 & 55.98 \\ \hline 49 & 12/1/17 & 63.19 & 55.53 \\ \hline 50 & 1/1/18 & 65.16 & 56.15 \\ \hline 51 & 2/1/18 & 59.15 & 55.04 \\ \hline 52 & 3/1/18 & 59.39 & 57.77 \\ \hline 53 & 4/1/18 & 61.42 & 56.52 \\ \hline 54 & 5/1/18 & 65.07 & 55.13 \\ \hline 55 & 6/1/18 & 68.95 & 47.54 \\ \hline 56 & 7/1/18 & 69.29 & 52.17 \\ \hline 57 & 8/1/18 & 73.44 & 53.45 \\ \hline 58 & 9/1/18 & 73.59 & 56.06 \\ \hline 59 & 10/1/18 & 72.62 & 58.49 \\ \hline 60 & 11/1/18 & 73.91 & 66.40 \\ \hline 61 & 12/1/18 & 65.80 & 64.72 \\ \hline \end{tabular}