Question: The variance of a discrete random variable is defined as , which in turn is defined as . The standard deviation of a discrete random

The variance of a discrete random variable is defined as , which in turn is defined as . The standard deviation of a discrete random variable is the square root of the variance: . Use the equation shown in the margin to calculate Var(G), the variance of the number of green lights that Nicholas encounters.Var(G) = [ P(x) * (x - ) ]

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