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jakhunter354
28.07.2019 •
Mathematics
10% of a group is left handed. if a random sample of 12 switches is selected, what is the probability of exactly two of the switches being defective? (use binomial distribution formula)
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Ответ:
For a binomial distribution, probability(r out of n) = (nCr) (p)^r (q)^(1-r)
p = 10% = 0.1, q = 1 - p = 0.9
r = 2 switches, n = total of 12 switches
probability = (12C2) (0.1)^2 (0.9)^(12-2)
probability = 66(0.1)^2 (0.9)^10
probability = 0.23
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