math

The breaking strength (in pounds) of a certain new synthetic is normally distributed, with a mean of 125 and a variance of 25. The material is considered defective if the breaking strength is less than 113 pounds. What is the probability that a single, randomly selected piece of material will be defective? (You may need to use the standard normal distribution table.

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  1. var=25 means std=5
    113 is 12 below the mean, or 2.4 std
    So, what's P(Z < -2.4)

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    posted by Steve

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