For C the question says , less than 139 minutes

World class marathon runners are known to run that distance (26.2 miles) in an average of 145 minutes with a standard deviation of 15 minutes. If we sampled a group of world class runners from a particular race, find the probability of the following: **(use 4 decimal places)\" a.) The probability that one runner chosen at random finishes the race in less than 139 minutes. C] b.) The probability that 10 runners chosen at random have an average finish time of less than 139 minutes. S c.) The probability that 50 runners chosen at random have an average finish time of less than