a. The mean is:
"X = (30 + 44 + 54 + 50 + 36 + 42 + 46 + 42)\/8 = 43"minutes.
b. The standard deviation is:
"Sx = (\\frac{(30 - 43)^2 + (44 - 43)^2 + (54 - 43)^2 + (50 - 43)^2 + (36 - 43)^2 + (42 - 43)^2 + (46 - 43)^2 + (42 - 43)^2} {8 - 1})^0.5 = 7.56." c. The mode is 42.
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