Math

The batteries from a certain manufacturer have a mean lifetime of
890
hours, with a standard deviation of
90
hours. Assuming that the lifetimes are normally distributed, complete the following statements.

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asked by Nathan
  1. 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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    posted by PsyDAG

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