1.

In an examination, average marks obtained by 20 girls are 50 and average marks obtained by 30 boys are 60. Find the average marks of the whole class?1. 552. 543. 56.54. 56

Answer» Correct Answer - Option 4 : 56

Given:

Total number of girls = 20

Average marks of all girls = 50

Total number of boys = 30

Average marks of all boys = 60

Concept:

Average marks = Total marks / Total persons

Solution:

Total marks obtained by all girls = 20 × 50 = 1,000

Total marks obtained by all boys = 30 × 60 = 1,800

Average marks of whole class = (1,000 + 1,800)/(20 + 30)

⇒ 2,800/50 = 56



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