Binomial probabilities directly
Compute the following binomial probabilities directly from the formula for b(x; n, p). (Round your answers to three decimal places.)
P(3 ? X ? 5)
when n = 7 and p = 0.65
P(1 ? X)
when n = 9 and p = 0.15
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A cast a die a number of independent times until a multiple of 3 appears on the top side of the die. Find the probablity that more then seven casts needed to obtain the fist multiple of three?
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