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Mathematics, 26.09.2019 14:30 sunny3799

Suppose that x is a random variable with mean 20 and standard deviation 5. also
suppose that y is a random variable with mean 40 and standard deviation 10. find the
variance and standard deviation of the random variable z for each of the following
cases. be sure to show your work.
(a) z = 2 + 10x.
(b) z = 10x − 2.
(c) z = x + y.
(d) z = x − y.
(e) z = −3x − 2y.

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