(d) Z = X – Y.

MATLAB: An Introduction with Applications
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I need some help with my stats homework. This comes from the textbook introduction to the practices of statistics ninth edition. Can you help me please. Only do (d)
4.72 Find some variances and standard deviations.
Suppose that X is a random variable with mean 30 and
standard deviation 4. Also suppose that Y is a random
variable with mean 50 and standard deviation 8. Assume
that the correlation between X and Y is zero. Find the vari-
ance and the standard deviation of the random variable Z
for each of the following cases. Be sure to show your work.
(a) Z = 35 – 10X.
(b) Z = 12X - 5.
%3D
Transcribed Image Text:4.72 Find some variances and standard deviations. Suppose that X is a random variable with mean 30 and standard deviation 4. Also suppose that Y is a random variable with mean 50 and standard deviation 8. Assume that the correlation between X and Y is zero. Find the vari- ance and the standard deviation of the random variable Z for each of the following cases. Be sure to show your work. (a) Z = 35 – 10X. (b) Z = 12X - 5. %3D
(c) Z = X + Y.
(d) Z = X – Y.
(e) Z = -2X + 2Y.
Transcribed Image Text:(c) Z = X + Y. (d) Z = X – Y. (e) Z = -2X + 2Y.
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