P(X) = n! / x! (n-x)! p^x (1-p)^(n-x)

P(X) = 5! / 1! (5-1)! (.30)^1 (1-.30)^5-1

P(x) = 120 / 1 (24) (.30) (.24)

P(X) = 5 (.30) (.24)

P(X) = Exactly once = .36

P(X) = At least once = 1 -.36 = .64

- Thread starter ANNJALA
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- Tags binomial probability