A bag contains 4 red marbles and 6 blue marbles. A marble is drawn and then replaced. This is done 50 times. Round all answers to the nearest hundredth (two decimal places). What is the probability that a red marble is drawn:

a. exactly 15 times:

b. at least 15 times:

c. at most 15 times:

d. less than 15 times:

e. between 17 and 25 times, inclusive: