SOLUTION: If 40% of the people in the community use the library in one year, for a sample of 4 people find:
i) The probability that at least 3 used the library.
ii) The mean number of li
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Question 835718: If 40% of the people in the community use the library in one year, for a sample of 4 people find:
i) The probability that at least 3 used the library.
ii) The mean number of library users.
iii) The variance of the number of library users. (
Answer by reviewermath(1029) (Show Source): You can put this solution on YOUR website!
If 40% of the people in the community use the library in one year, for a sample of 4 people find:
X~Binomial(4, 0.4)
i) The probability that at least 3 used the library.
P(X ≥ 3) = =
ii) The mean number of library users.
mean, E(X) = np = 4(0.4) =
iii) The variance of the number of library users
variance, Var(X) = npq = 4(0.4)(0.6) =
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