Refer to Exercise 4. The total number of assemblies that fail to meet specifications is X+Y.
a. Find 
.
b. Find 
.
c. Find P(X+Y=3).
(a) 
= 0.89 + 1.22 = 2.11
(b) 
= 1.4135
(c) P(X + Y = 3) = ?(0, 3) + ?(1, 2) + ?(2, 1) + ?(3, 0) = 0.10 + 0.05 + 0.05 + 0.04 = 0.24
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