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ER promises you will be seen in 10 minutes. the standard deviation is 2 minutes. chance someone will wait more than 13 minutes.

i don't know what to do without a population size or sample size

  • statistics -

    Try z-scores.

    z = (x - mean)/sd

    Once you have the z-score, check out a z-table for your probability. (Remember that the problem is looking for "more than 13 minutes" when you determine the probability.)

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