MATH254: Tutorial Exercise for Week 6
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MATH254: Tutorial Exercise for Week 6
1. Suppose X has pdf
fx (x) =
Evaluate the constant k .
Find the range of possible Y values and the pdf fY (y) of Y when (a) Y = .3X + 3, (b) Y = 1/X .
2. Suppose X has distribution function
0 x < 0
Fx (x) = . (1 .cos(x)) /2 0 一 x 一 π
, 1 x > π
and that Y = lX .
What is the range of Y?
Find the distribution function FY (y) of y, and hence find the pdf of Y .
3. Discrete random variables X and Y have joint probability mass function given by
Y = 1 Y = 2 Y = 3 Y = 4
X = 1 2/32 3/32 4/32 5/32
X = 2 3/32 4/32 5/32 6/32
Obtain the marginal probability mass function of X and the conditional probability mass function of Y given that X = 2. Also obtain E[X], E[Y], E [Y | X = 2].
4. Let X and Y be independent geometric random variables having respective mass function
P (X = n) = (1 .p1 )n − 1p1 , (n = 1, 2, . . .), 0 < p1 < 1, P (Y = m) = (1 .p2 )‰ − 1p2 , (m = 1, 2, . . .), 0 < p2 < 1.
Determine the mass function of Z = min{X, Y }.
2022-03-07