A lot of 1000 components contains 250 that are defective. Two components are drawn at random and tested. Let $A$ be the event that the first component drawn is defective, and let $B$ be the event that the second component drawn is defective.
Find $P ( B \mid A )$.
A) 0.2492
B) 0.25
C) 0.0623
D) 0.004

Question

Quizplus · Accepted Answer

Given that the first component drawn is defective, there are now 249 defective components left out of a total of 999 components. Thus, $P(B|A) = \frac{249}{999} = 0.2492$.

A Lot of 1000 Components Contains 250 That Are Defective AAA

A Lot of 1000 Components Contains 250 That Are Defective $A$