Question

Mean of
100 numbers was found to be 50. But
later on, it was observed that one of the
number 150 was
wrongly taken as 50 The correct
mean is,
a) 49
b)50
c)51
d)52,​

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