Fifteen items or less: The number of customers in line at a supermarket express checkout counter is a random variable with the following probability Espanol distribution. X 0 2 3 4 5 P (x) 0.05 0.25 0.30 0.25 0.10 0.05 Send data to Excel Part: 0 / 3 Part 1 of 3 (a) Compute the mean Hy . Round the answer to two decimal places. HY = X Part: 1 / 3 Part 2 of 3 (b) Compute the standard deviation O . Round your answer to 4 decimal places if necessary