- #1
maxsthekat
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The length of time, in minutes, for an airplane to obtain clearance for takeoff is a random variable Y = 4X + 2, where X has the density function:
f(x) = 1/3 e^(-x/3) for x > 0
Find the variance of Y.
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I found the expected value of X to be 14 minutes, which was correct. This means the variance for X will be: E(X^2) - E(X) = 18 - 14 = 4. Will the following work for the variance?
Var(Y) = (4^2)(4) = 64.
If so, what does that mean to have a "negative" take off time?
Thanks for your help! :)
f(x) = 1/3 e^(-x/3) for x > 0
Find the variance of Y.
-----
I found the expected value of X to be 14 minutes, which was correct. This means the variance for X will be: E(X^2) - E(X) = 18 - 14 = 4. Will the following work for the variance?
Var(Y) = (4^2)(4) = 64.
If so, what does that mean to have a "negative" take off time?
Thanks for your help! :)