2. Suppose the population/probability distribution for random variable X, the number of cars a family owns, is: X 0 1 2

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2 Suppose The Population Probability Distribution For Random Variable X The Number Of Cars A Family Owns Is X 0 1 2 1 (47.4 KiB) Viewed 98 times

2. Suppose the population/probability distribution for random variable X, the number of cars a family owns, is: X 0 1 2 3 f(x) 0.35 0.4 0.15 0.1 This means, for example, that 20 percent of families do not own a car, 40 percent of families have 1 car, etc. (a) What is the mean or expected number of cars, i.e. E[X] or ux? (b) Using the formula E[(X-4x)2], calculate the variance of the number of cars, i.e. Var(X) or o? (c) Using the alternative formula E[X2] – E[X]to recalculate variance, confirm you get the same answer as (b).