Question

mean of 9 observation was found to be 35 later on it was detected that an observation 81 was nice and so does 18 find the correct mean of observation

Answer 1

the sum of all the observation originally was 10 into 28 equal to 280 Biswajit and to hai so the correct sum is 280 minus 10 equal to 270 does the means is 270 by 10 equals to 27 c

Answer 2

mean =35
81 reads 18 means
81-18=63 is less in previous mean
as Observastion 9
so 63/9=7 more will be correct mean that means correct mean =35+7=42