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Percent of marriages end in divorce

Forty-three percent of marriages end in divorce. You randomly select 15 married couples. Find the probability exactly 5 of the marriages will end in divorce.

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## Q : Confidence interval for the mean

In a manufacturing process a random sample of 49 bolts manufactured has a mean length of 1.67 inches with a standard deviation of .07 inches. What is the 80% confidence interval for the mean