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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 |
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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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