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78% of all students at a college still need to take another math class. If 36...

78% of all students at a college still need to take another math class. If 36 students are randomly selected, find the probability that

a. Exactly 27 of them need to take another math class.
b. At most 27 of them need to take another math class.
c. At least 27 of them need to take another math class.
d. Between 23 and 30 (including 23 and 30) of them need to take another math class.

Math   Statistics-And-Probability   
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