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The mean age of a class of twenty five students is 23.4 years. How old would a twenty sixth student have to be for the mean age of the class to be 24.0 years?

  • Math -

    The sum of ages of the 25 students = 25(23.4) = 585

    the sum of ages of 26 students = 26(24) = 624

    So the 26th student must be 624-585 or 39 years old

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