WAEC - Mathematics (1995 - No. 45)
The mean of 20 observations in an experiment is 4, lf the observed largest value is 23, find the mean of the remaining observations.
4
3
2.85
2.60
2.56
Giải thích
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