Homework Help: standard deviations

Posted by Anonymous on Sunday, December 4, 2011 at 9:21pm.

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?

standard deviations - PsyDAG, Monday, December 5, 2011 at 10:07am
Z = (score-mean)/SD

Variance = SD^2

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

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