state gov RPSC 2nd Grade Senior Teacher Mock Test Series 2025 Mathematics Statistics Measures of Central Tendency
The mean of a group of 100 observations was found to be 20. Later it was found that four observations were incorrect, which were recorded as 21, 21, 18 and 20. What is the mean if the incorrect observations are omitted?
1
18
2
20
3
21
4
22
5
Question Not Attempted