You can put this solution on YOUR website! The mean of 20 observations in an experiment is 4.
If the observed largest value is 23, Find the mean of the remaining observations.
:
let a = the average of the remaining 19 observatons
19a + 23 = 4 * 20
19a = 80 - 23
19a = 57
a = 57/19
a = 3 is the mean of the remaining observatons