Question on: WAEC Mathematics - 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
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Correct Option: B
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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