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Math · Statistics And Probability
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There are two traffic lights on a commuters route to and from work. Let X1 be the number of lights at which the commuter must stop on his way to work, and X2 be the number of lights at which he must stop when returning from work. Suppose that these two variables are independent, each with the pmf given in the accompanying table (so X1, X2 is a random sample of size n 2). 0.7, o2 0.41 p(x1) 0.1 0.4 0.5 (a) Determine the pmf of T 1 X2. p(to) (b) Calculate ALTO How does it relate to Au, the population mean? HT, (c) Calculate o How does it relate to o2, the population variance? (d) Let X3 and X4 be the number of lights at which a stop is required when driving to and from work on a second day assumed independent of the first day. With To the sum of all four Xis, what now are the values of E(To) and V(To)? E(To) V(To)

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