1. If mean = 10, standard deviation = 2, and X = 12 which is the correct z-score? A) 0.8413 B) 0.1587 C)0.68 D) 0.3413 E) none of the above 2. Suppose that 8% of the first batch of engines off a new production line have flaws. An inspector randomly selects 25 engines for testing. What is the expected number of flawed engines in the sample? a) 0.24 b) 4 c) 2 d) 1 e) None of the above