the choices for b are : is not and is

A pizza restaurant claims that its mean delivery time is 21 minutes. An independent company times a randomly selected delivery, which takes 29 minutes. Complete parts [a] through (d) below Click here to view page 1 of the standard normal distribution table. Click here to view [age 2 of the standard normal distribution table. a. Assuming the delivery times are approximately normally distributed with mean 21 minutes and standard deviation 3 minutes, nd the probability that a randomly selected delivery would take at least 29 minutes. The probability that a randomly selected delivery would take at least 29 minutes is (Round to three decimal places as needed.) b. If the assumptions made in part (a) are true, is the 29-minute delivery an unusual event? The delivery Y an unusual event because the zscore of the observation is (Type an integer or decimal rounded to two decimal places as needed.) c. Describe a scenario in which the 297minute delivery is not an unusual event. 0 A. The mean delivery time is 29 minutes. 0 B. The standard deviation is 2 minutes. O C. The mean delivery time is 3 minutes. 0 D. The 29-minute delivery is not an unusual event in the current situation