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The average height of 30 girls out of a class of 40 is 160 cms and that of the remaining girls is 156 cms. What is the average height of the whole class?
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- 155 cm
- 157 cm
- 159 cm
- None of these
- 155 cm
Correct Option: C
As per the given in question ,
Total height of the whole class = (30 × 160) + (40 – 30) × 156 = 6360 cms
Average height of the whole class = 6360 ÷ 40 = 159 cms.
