Homework Help: math

Posted by Anonymous on Friday, December 21, 2012 at 12:37pm.

The breaking strength (in pounds) of a certain new synthetic is normally distributed, with a mean of 173 and a variance of 9. The material is considered defective if the breaking strength is less than 167 pounds. What is the probability that a single, randomly selected piece of material will be defective?

math - PsyDAG, Saturday, December 22, 2012 at 11:38am
Z = (score-mean)/SD

variance = √SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.

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