Earnings per share. The earnings per share (in dollars) for 12 companies selected at random from the list of Fortune 500 companies are: 0.61 0.72 4.66 6.83 6.09 8.44 1.62 5.63 4.11 3.44 8.48 8.48 a. Find the mean of the earnings per share. $ 4.93 (Type an integer or a decimal. Round to two decimal places.) b. Find the standard deviation of the earnings per share. $| (Type an integer or a decimal. Round to two decimal places.)