Can I have help with this?

Of all those mountain climbers who attempt to climb Mt. Everest, only 90% reach the summit. A random sample of 7 mount climbers who attempt to climb Mt. Everest have been selected. Let X denote the random variable that gives the number of climbers who reach the summit.a. Check if this experiment satisfies all the four requirements of a binomial experiment. b. Find the probability that exactly 6 of the 7 climbers reach the summit. Show your calculation work.c. Find the probability that more than 5 of the 7 climbers reach the summit. Show your calculation work