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March 28, 2017

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On a certain exam, Tony corrected 10 papers and found
the mean for his group to be 70. Alice corrected the remaining
20 papers and found that the mean for her
group was 80. What is the mean of the combined group
of 30 students?

  • math - ,

    10 * 70 = 700
    20 * 80 = 1600

    700 + 1600 = 2300
    2300 / 30 = ?

  • math - ,

    76.6

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