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Electricity bills in a certain city have mean $120.08. Assume the bills are normally distributed with standard deviation $14.40. Find the value that separates the lower 52% of the bills from the rest.

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Anonymous

  1. Z = (score-mean)/SD

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.52) and its Z score. Insert in above equation and solve for score.

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    PsyDAG

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