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The batteries from a certain manufacturer have a mean lifetime of
hours, with a standard deviation of
hours. Assuming that the lifetimes are normally distributed, complete the following statements.

  • Math (?) - ,

    What statements? You cannot copy and paste here.

    Just guessing:

    Z = (score-mean)/SD

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related to your Z scores.

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