Question

What is the wine of all the 250 items ?

• A. $44$
• B. $53.3$
• C. $55.6$
• D. $59.3$

Answer 1

The correct option is A $44$

The mean and standard deviation of 100 items are 50,5 and that of 150 items are 40,6 respectively.

For the wine of all the 250 items =

We know that mean is $\frac{(50+40)}{2}=45$

Then standard deviation $S=\sqrt{S^2}$

$S^2=(X_1-X)$

$S^2=(6-5{)}^2=1^2$

then $\sqrt{1^2}=1$

Finally, the wine of all the 250 items = $45-1=44$