1.

The mean of 4 observations is 20. If one observation is excluded, the mean of the remaining observation becomes 15. Find the excluded observation.​

Answer»

LET X be the sum of all observation

then

x/4=20

x=80

now let sum y THREE observation is y

then

y/3=15

y=45

now the excluded number=x-y=80-45=35



Discussion

No Comment Found

Related InterviewSolutions