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WAEC 2022 · Paper 1 · Q33

The mean of a set of 10 numbers is 56. If the mean of the first nine numbers is 55, find the 10th number.

Worked solution (try it first)
  1. Total of all 10 numbers: 10×56=56010 \times 56 = 560.
  2. Total of the first nine: 9×55=4959 \times 55 = 495.
  3. The 10th number is the difference: 560−495=65560 - 495 = 65, option B.

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