JEE Main 202116 Mar, Evening shiftMathematicsMediumStatistics and Probability258× since 2002
Consider the statistics of two sets of observations as follows :
| Size | Mean | Variance
Observation I | 10 | 2 | 2
Observation II | n | 3 | 1
If the variance of the combined set of these two observations is , then the value of n is equal to ___________.