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3 December, 11:12

If 3 students averaged 68 on a test and 4 students averaged 75, what is the average of all 7 students

A=70

B=71

C=72

D=73

E=74

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Answers (1)
  1. 3 December, 11:16
    0
    Option C

    Step-by-step explanation:

    Total score for 3 students will be given by the product of average and frequency.

    Total score for three students will then be 68*3=204

    Similarly, for 4 students, their total score will also be given by

    4*75=300

    Adding the total score for the two groups

    300+204=504

    To get the average of all the 7 students, we divide the total score by frequency hence 504/7=72

    Therefore, option C is correct
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