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lcc
Apr 17, 2007, 05:55 AM
the probability that an adult was never married is 15%. In a random survey of 10 adults, what is the probability that at least 8 were married

galactus
Apr 17, 2007, 09:13 AM
This is just binomial probabilty.

\sum_{k=8}^{10}C(10,k)(0.15)^{k}(0.85)^{10-k}