Question

A poll reported that 63​% of adults were satisfied with the job the major airlines were...

A poll reported that 63​% of adults were satisfied with the job the major airlines were doing. Suppose 15 adults are selected at random and the number who are satisfied is recorded.

(c) Find and interpret the probability that at least 11 of them are satisfied with the airlines.

The probability that at least 11 adults are satisfied with the airlines is ____

Math   Statistics-And-Probability   
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Answer #1

P(satisfied) = 0.63

n = 15

(C) P(at least 11 are satisfied )

At least 11 are satisfied which mean 11 or 12 or 13 or 14 or all 15 are satisfied.

P(at least 11 are satisfied ) = P(11) + P(12) + P(13) + P(14) + P(15)

P(at least 11 are satisfied ) = P(11) + P(12) + P(13) + P(14) + P(15) = 0.2938

ANS : Hence the probabiltiy that atleast 11 adults are satisifed is 0.2938

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