SOLUTION: if 40% of the people in a community use the park in one year, find the probability for sample of 15 people: exactly 9 use the park and at most 4 used the park.

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Question 333915: if 40% of the people in a community use the park in one year, find the probability for sample of 15 people: exactly 9 use the park and at most 4 used the park.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
if 40% of the people in a community use the park in one year, find the probability for sample of 15 people: exactly 9 use the park and at most 4 used the park.
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Binomial Problem with n = 15 and p = 0.4
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P(x=9) = 15C9(0.4)^9*(0.6)^6 = 0.0612
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P(0<= x <=4) = binomcdf(15,0.4,4) = 0.2173
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Cheers,
Stan H.