Question

A candidate obtained the following percentage of marks in an examination English 60, Maths 90, Physics 75, Chemistry 66. If weight 2,4,3,3 are allotted to these subjects respectively, then the weight mean is given by

• A. $\frac{60+90+75+66}{2+4+3+3}$
• B. $\frac{60\times 2+90\times 4+75\times 3+66\times 3}{2+4+3+3}$
• C. $\frac{60\times 2+90\times 4+75\times 3+66\times 3}{4}$
• D. $\frac{60+90+75+66}{4}$

Answer 1

The correct option is B $\frac{60\times 2+90\times 4+75\times 3+66\times 3}{2+4+3+3}$

Percentage marks in the examination-

English=60

Maths=90

Physics=75

Chemistry=66

Weight allotted to each subjects are-

English=2,Maths=4,English=3 and chemistry=66

Mean=$\frac{sumofallobservationvalue}{Sumofallobservation}$

$\therefore$ Weight mean=$\frac{60\times 2+90\times 4+75\times 3+66\times 3}{2+4+3+3}$