SOLUTION: If the probability that a student in the statistic class will score grade A in the final exams is 0.72, determine the probability that out of 5 students selected random from the cl
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Question 469896: If the probability that a student in the statistic class will score grade A in the final exams is 0.72, determine the probability that out of 5 students selected random from the class at least 2 scored grade A? Answer by ewatrrr(24785) (Show Source):
Hi,
Note: The probability of x successes in n trials is:
P = nCx* where p and q are the probabilities of success and failure respectively.
In this case p = .72 & q =.28
nCx =
5 students selected
P(at least 2 scored an A) = 1 - P(0 scoring an A) -P(1 scoring an A)
= 1 - (.28)^5 - 5(.72)^1(.28)^4 = .9762
