Question 204452This question is from textbook elementary statistics
: In a Gallup Survey, 90% of the people interviewed were unaware that maintaining a healthy weight could reduce the risk of stroke. If 15 people are selected at random, find the probability that at least 9 are unaware that maintaining a proper weight could reduce the risk of stroke.
This question is from textbook elementary statistics
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! In a Gallup Survey, 90% of the people interviewed were unaware that maintaining a healthy weight could reduce the risk of stroke. If 15 people are selected at random, find the probability that at least 9 are unaware that maintaining a proper weight could reduce the risk of stroke.
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It's a binomial problem with n=15, p = 0.9, and 9<=x<=15
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I used a TI calculator to get:
P(9<=x<=15) = 1 - binomcdf(15,0.9,8) = 0.999689
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Cheers,
Stan H.
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