Question

If the sum of the observations of $50$ observations from $30$ is $50$, then the mean of these observations is:

• A. $50$
• B. $30$
• C. $31$
• D. $51$

Answer 1

The correct option is C $31$

Mean $=\frac{sumofobservation}{no.ofobservation}$

sum of observation$=50$

no. of observation$=50$

mean$=\frac{50}{50}=1$

But observation start from $30$ then mean$=30+1$

$[$mean$=31]$.