What is the expected number of baby girls in the sample of, Ask an Expert

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Suppose the probability that a birth results in a girl baby is 0.5 and consider a sample of the next 40 births. Let X = # of girl births in the sample. Assume that X has a binomial distribution.

What is the expected number of baby girls in the sample of 40 births? What is the standard deviation of this binomial distribution?

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