Question

a) The mean of 100 observations is 50. If two observations which were 50 and 60 are replaced by 150 and 160 respectively, find the new mean?​

Answer 1

Answer:

Mean of 100 observation =50

∴Total of 100 observation=100×50=5000

If one of the observation 50 is replaced by 150 than total of new observation is=5000−50+150=5100

Hence the mean of new 100 observation=

100

5100

=51