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April 24, 2014

Homework Help: Stats

Posted by Chris on Thursday, October 21, 2010 at 2:58am.

A random sample of two hundred fifteen adults is selected from a certain population of
registered voters. Assume the population is 20% democrats. Use a normal approximation
to estimate
(a) the probability the sample contains exactly 48 democrats, and
(b) the probability the sample contains more than 40 democrats.

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