N + n P (x) 0.05 0.25 0.35 0.20 0.10 0.05 Send data to Excel Part 1 of 3 (a) Compute the mean uy. Round the answer to two decimal places. Hy = 2.20 X Part 2 of 3 (b) Compute the standard deviation or. Round your answer to 4 decimal places if necessary. ox = X Part: 2 / 3 Part 3 of 3 (c) If each customer takes 2 minutes to check out, what is the probability that it will take more than 4 minutes for all the customers currently in line to check out? The probability that it will take more than 4 minutes for all the customers currently in line to check out is X