One-Variable Data: Distributions and Measures of Center and Spread

SAT Math· difficulty 3/5

The mean of 10 numbers is 50. If two numbers, 90 and 110, are removed, what is the new mean of the remaining 8 numbers?

  • A

    40

  • B

    42

  • C

    45

  • D

    37.5

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Explanation

Original sum = 10×50=50010 \times 50 = 500. New sum = 50090110=300500 - 90 - 110 = 300. New mean = 300/8=37.5300/8 = 37.5.

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