Homework Answers
If A and B are independent, P(A and B) = P(A) x P(B)
P(X misses the error) = 0.12
P(Y misses the error) = 0.15
P(a typographical error will be missed by both proofreaders) = P(X misses the error) x P(Y misses the error)
= 0.12 x 0.15
= 0.018
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