Math

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You survey 1000 new home buyers and find that the mean price was $185,000 and the standard deviation was $20,000. How many paid more than $210,000?

  • Math -

    210000 - 185000 = 25000

    25000 / 20000 = 1.25 s.d. above the mean
    ... this is the z-score

    use a table to find the fraction above this z-score

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