Homework Help: alegbra

Posted by apryl on Sunday, August 28, 2011 at 2:33pm.

The breaking strength (in pounds) of a certain new synthetic is normally distributed, with a mean of 167 and a variance of 9. The material is considered defective if the breaking strength is less than 161 pounds. What is the probability that a single, randomly selected piece of material will be defective? (Give the answer to two decimal places.)

alegbra - PsyDAG, Sunday, August 28, 2011 at 2:55pm
Z = (score-mean)/SD

Variance = SD^2

Use the same table.

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