MATH

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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 -

    z=(166-175)/9=-1
    Look up the probability for z=-1.

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