Question: Refer to Exercise 12. Let Z = X + Y represent the total number of repairs needed. a. Find Z . b. Find

Refer to Exercise 12. Let Z = X + Y represent the total number of repairs needed.

a. Find μZ.

b. Find σZ.

c. Find P(Z = 2).

Refer to Exercise 12.

y 1 2 3 0.13 0.10 0.07 0.03 1 0.12 0.16 0.08

y 1 2 3 0.13 0.10 0.07 0.03 1 0.12 0.16 0.08 0.04 2 0.02 0.06 0.08 0.04 3 0.01 0.02 0.02 0.02

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