Question

The mean of $10$ observation is $25.$ If one observation, namely $25,$ is deleted, the new mean is ,

• A. $25$
• B. $20$
• C. $28$
• D. $22$

Answer 1

The correct option is A $25$

The sum of $10$ observations is $250.$
$\therefore$ New mean$=\frac{250-25}{9}=\frac{225}{9}=25$.