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A couple plans to have children until they get a​ girl, but they agree they will...

A couple plans to have children until they get a​ girl, but they agree they will not have more than three​ children, even if all are boys. Assume that the probability of having a girl is 0.51. Let X be a random variable indicating how many children the couple will have. Find the standard deviation of the random variable X. x 1 2 3 ​P(Xequals​x) 0.510 0.250 0.240

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