Question

Suppose for $40$ observations, the variance is $50$. If all the observations are increased by $20$, the variance of these increased observation will be

• A. $20$
• B. $50$
• C. $30$
• D. None of these

Answer 1

The correct option is B $50$

The variance for $40$ observations is $50$

Variance is independent of the number of observations. Therefore, variance for $60$ observations is $50$