Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test Mathematics Statistics Variance and Standard Deviation
The mean and standard deviation of 75 observations are 45 and 10, respectively. If 2 is added to each observation, the new mean and standard deviation will be
1
47, 12
2
47, 14
3
47, 10
4
More than one of the above
5
None of the above