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The lifetime of a 2- volt non-rechargeable battery in constant use has a normal distribution of 516 hours and a standard deviation of 20 hours. What is the z- score for batteries with lifetimes of 520 hours?

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    Use z-scores.

    z = (x - mean)/sd

    With your data:
    z = (520 - 516)/20

    I'll let you finish the calculation.

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