Mean height of 20 boys and 15 girls is 161 cm. Mean height of 14 girls is 151 cm. What is the mean height of 20 boys?
- 169 cm
- 172 cm
- 165 cm
- 160 cm
Explanation
Total students = 35 → Total height = 35 × 161 = 5635 cm
14 girls = 14 × 151 = 2114 cm
So, 15 girls = (2114 + x) → x = height of 1 girl = assume x = 151
Total height of 15 girls ≈ 15 × 151 = 2265
Total height of boys = 5635 - 2265 = 3370
Mean height of 20 boys = 3370 ÷ 20 = 169 cm
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