Question 857348
The question is : Mean of 20 observations is 17. If in the observations, observation 40 is replaced by 12, find the new mean.
:
Find the sum of the other 19 observations
{{{((n + 40))/20}}} = 17
multiply both sides by 20
n + 40 = 340
n = 340 - 40
n = 300
"observation 40 is replaced by 12,
m = {{{((300 + 12))/20}}}
m = 312/20
m = 15.6 is the new mean