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The average height of 25 girls is 1.2 m. When 5 girls leave the group, then the height increases by 0.16 m. What is the average height of the 5 girls who left?1. 0.52 m2. 0.42 m3. 0.44 m4. 0.56 m |
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Answer» Correct Answer - Option 4 : 0.56 m Given: Average height of 25 girls = 1.2 m Formula Used: Average = (Sum of heights)/Number of girls Calculation: Sum of the height of the 25 girls = 25 × 1.2 ⇒ 30 m Sum of the height of the 20 girls after 5 left = 20 × 1.36 ⇒ 27.2 m Sum of the heights of the 5 girls = 30 – 27.2 ⇒ 2.8 m Required average = 2.8/5 ⇒ 0.56 m ∴ The average height of the 5 girls is 0.56 m. |
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