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Let X be the number of pizzas sold and W be the number of burgers sold during a day at MeanGreen restaurant. X and W are random variables with E(X) 20 and E(W) 50 The prices of a pizza and a burger are $10 and S7, respectively. (a) (4 points) Find the expected daily revenue from pizza and burger sales (Hint: define R = 10X + 7W and use the expectation operator, E). (b) (4 points) Suppose Var(X) = 50, Var(W) = 10 and Cov(X,W) = 2. Find the variance of the daily revenue from pizza and burger sales.
math   Statistics-And-Probability   
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Answer #1

X he the number bul -十7关 (b) Var(X):Go. V (W)210 Cov (X,W)= 2 Vamamee $5770

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