The number of ships to arrive at harbor on any given day is the random variable represented by x. The probability distribution of x is as follows. (provide your answers correct to two decimal places.)
x: 10,11,12,13,14
P(x): 0.33,0.11,0.05,0.12,0.39
(a) Determine the mean of the number of ships that arrive at a harbor on a given day.
(b) Determine the standard deviation, ?, of the number of ships that arrive at a harbor on a given day.