Can someone show me how to do this problem? steps with explanations please

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A renovation of the gift shop at Orlando Amway Center has six activities (in hours). In the following table, the estimates of a, m, and b times for each of the activities are listed: a m b Activity A B 11 26 18 9 16 15 15 32 18 12 17 19 18 41 18 18 19 D F 21 Based on the activity time estimates, the expected times for each of the activities are (round your responses to two decimal places): Activity A Expected Time B C D E F Based on the activity time estimates, standard deviation for each of the activities is (enter your responses rounded to two decimal places): Standard Deviation Activity A B C D E F