. Variance:    The number of cars that pass through a toll booth in an hour follows a probability distribution with the following values: NUMBER OF CARS (X) PROBABILITY P(X) 0 0.1 1 0.3 2 0.4 3 0.2     Calculate the variance of the number of cars passing through the toll booth in an hour.

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A: Question 1To find the variance, we need to use the formula below. Formula:Variance=∑[x2×P(x)]−μ2…

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