Waiting times to receive food after placing an order at the local subway sandwich shop follow an exponential distribution with a mean of 68 seconds. calculate the probability a customer waits: a. less than 40 seconds. (round your answer to 4 decimal places.) probability b. more than 126 seconds. (round your answer to 4 decimal places.) probability c. between 45 and 74 seconds. (round your answer to 4 decimal places.) probabilityp d. fifty percent of the patrons wait less than how many seconds? what is the median? (round your answer to 2 decimal places.) median seconds