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June 2019 p61 q5
3011
In a certain country the probability that a child owns a bicycle is 0.65.
A random sample of 15 children from this country is chosen. Find the probability that more than 12 own a bicycle.
Solution
Let the random variable \(X\) represent the number of children who own a bicycle. \(X\) follows a binomial distribution with parameters \(n = 15\) and \(p = 0.65\).
We need to find \(P(X > 12) = P(X = 13) + P(X = 14) + P(X = 15)\).