Of those mountain climbers who attempt mt. McKinley, only 60% reach the summit. In a random sample of 14 mountain climbers who are going to attempt mt. McKinley, what is the probability of each of the following?
a. All 14 reach the summit
b. at least 8 reach the summit
c. no more than 12 reach the summit
d. from 10 to 13 reach the summit, including 10 and 13