71% of all students at a college still need to take another math class. If 38 students are randomly selected, find the probability thata. Exactly 28 of them need to take another math class.b. At most 29 of them need to take another math class.c. At least 27 of them need to take another math class.d. Between 22 and 27 (including 22 and 27) of them need to take another math class.