70% of all students at a college still need to take another math class. If 43 students are randomly selected, find the probability that a. Exactly 29 of them need to take another math class. b. At...

70% of all students at a college still need to take another math class. If 43 students are randomly selected, find the probability that


a. Exactly 29 of them need to take another math class.
b. At most 28 of them need to take another math class.
c. At least 32 of them need to take another math class.
d. Between 25 and 30 (including 25 and 30) of them need to take another math class.