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    Find probability using z score

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    Suppose that the net interest margins for all U.S. banks are normally distrubuted with a mean of 4.15 percent and a standard deviation of .5 percent.

    1. What is the probability that a randomly selected U.S.bank will have a net interest margin less than 4.40 percent?

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    https://brainmass.com/statistics/probability/probability-using-score-468025

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