11 part 3 please

Fifteen items or less: The number of customers in line at a supermarket express checkout counter is a random variable with the following proba distribution. 0 1 2 3 4 5 P(x) 0.05 0.30 0.30 0.20 0.10 0.05 Send data to Excel Part 1 of 3 (a) Compute the mean My. Round the answer to two decimal places. Ux = 2.15 X 5 Part: 1 / 3 Part 2 of 3 (b) Compute the standard deviation Up. Round your answer to 4 decimal places if necessary. ox = 5 X Part: 2 / 3 Part 3 of 3 check out? (c) If each customer takes 3 minutes to check out, what is the probability that it will take more than 9 minutes for all the customers currently in line The probability that it will take more than 9 minutes for all the customers currently in line to check out is X