The breaking strength (in pounds) of a certain new synthetic is normally distributed, with a mean of 175 and a variance of 9. The material is considered defective if the breaking strength is less than 166 pounds. What is the probability that a single, randomly selected piece of material will be defective? (
MATH - MathMate, Sunday, June 3, 2012 at 4:02pm
Look up the probability for z=-1.