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t was found that 40% of people have a dog as a pet. If a random...

t was found that 40% of people have a dog as a pet. If a random sample of 9 people is selected, what is the probability that 5 of them have a dog as a pet?

(That is, what is P(X=5)?)  (keep 4 decimal places)

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Answer #1

This is a binomial distribution.

p = 0.4

n = 9

P(X = 5) = 9C5 * 0.45 * (1-0.4)9-5 = 0.1672

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