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The mean of 20 observations in an experiment is 4. If the observed largest value...

Mathematics
WAEC 2025

The mean of 20 observations in an experiment is 4. If the observed largest value is 23, find the mean of the remaining observations.

  • A. 4
  • B. 2.60
  • C. 2.85
  • D. 3
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Correct Answer: Option D
Explanation

Total sum = 20 × 4 = 80

Remaining sum = 80 – 23 = 57

Remaining observations = 19

Mean = \(\frac{57}{19}\) = 3

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