Let X, Y be independent Poisson random variables with X~ Poisson (1.5), Y~ Poisson (0.5). Compute the probability P(X + Y ≤2). Express your answer up to 3rd decimal place.

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(d)
Let X, Y be independent Poisson random variables with X~ Poisson(1.5),
Y~ Poisson (0.5). Compute the probability P(X + Y ≤ 2). Express your answer up
to 3rd decimal place.
(You shall use calculator to complete this problem.) Suppose two random
variables X, Y admits density
f(x, y)
=
9
-x-3y
7(2x+y)e¯
"
x, y ≥ 0,
and f(x, y)
= 0 for other (x, y). Compute the covariance of X, Y. Use the result to
decide which of the following holds: Var[X + Y] < Var[X] + Var[Y], or =, or >.
Transcribed Image Text:(d) Let X, Y be independent Poisson random variables with X~ Poisson(1.5), Y~ Poisson (0.5). Compute the probability P(X + Y ≤ 2). Express your answer up to 3rd decimal place. (You shall use calculator to complete this problem.) Suppose two random variables X, Y admits density f(x, y) = 9 -x-3y 7(2x+y)e¯ " x, y ≥ 0, and f(x, y) = 0 for other (x, y). Compute the covariance of X, Y. Use the result to decide which of the following holds: Var[X + Y] < Var[X] + Var[Y], or =, or >.
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