Question

The mean of200 items was 50 later on it was found that two otems were misread as 92 and 8instead of 192 and 88 find out the correct mean​

Answer 1

mean of 200 items = 50

and,

the sum of 200 items =200×50

= 10000

now,

correct sum=10000-(92+8)+(192+88)

= 10180

then,

correct mean =10180/200

=50.9