railway RRB Technician Grade 1 Mock Test 2024 Mathematics Statistics Variance and Standard Deviation
The mean of 5 items of an observation is 4 and the variance is 5.2. If three of the items are 1, 2 and 6, then the other two items are:
1
3, 8
2
4, 7
3
5, 6
4
9, 2