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

Mathematics
WAEC 1995

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

  • A. 4
  • B. 3
  • C. 2.85
  • D. 2.60
  • E. 2.56
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Correct Answer: Option B
Explanation

Mean of 20 observations = 4

All the observations = 20 x 4 = 80

Largest observed value = 23

Remaining observation = 80 - 23 = 57

Mean of observation = 57/19 = 3

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