1.

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

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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