SOLUTION: A recent survey found that 62% of adults misplace their car keys on a regular basis. Assume a sample size of 42 adults. A)Find the probability that exactly 21 adults misplace th

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Question 751450: A recent survey found that 62% of adults misplace their car keys on a regular basis. Assume a sample size of 42 adults.
A)Find the probability that exactly 21 adults misplace their keys on a regular basis.
B) Find the probability that 18 or fewer adults misplace their keys on a regular basis.
Answer by reviewermath(1029) About Me  (Show Source):
You can put this solution on YOUR website!
X ~ Binomial(42, 0.62)
a. P(X = 21) = %28matrix%282%2C1%2C42%2C21%29%29%280.62%5E21%29%280.38%5E21%29 = highlight%280.0352%29
b. P(X ≤ 18) = = highlight%280.0091%29