InterviewSolution
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Five girls have an average height of 1 m 67 cm. Two girls of height 1 m 56 cm and 1 m 69 cm leaves the group. Find the new average height of girls. 1. 150 cm2. 160 cm3. 170cm4. 98 cm |
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Answer» Correct Answer - Option 3 : 170cm Given: Average height of 5 girls = 1 m 67 cm = 167 cm. Two girls of height 1 m 56 cm and 1 m 69 cm leaves the group. Formula used: Average of numbers = (sum of all observations)/(total numbers of observations) Calculation: Sum of all observations = (average of numbers) × (total numbers of observations) Average height of 5 girls = 167 cm Sum of height of 5 girls = 167 × 5 ⇒ Sum of height of 5 girls = 835 cm Two girls left the group, Total sum of height two of girls = 156 cm + 169 cm ⇒ Total sum of height two of girls = 325 cm Total sum of height of remaining 3 girls = ( 835 – 325) ⇒ Total sum of height of remaining 3 girls = 510 cm Average of numbers = (sum of all observations)/(total numbers of observations) So, Average of height of three girls = 510/3 ⇒ Average of height of three girls = 170 cm ∴ Average of height of three girls is 170cm.
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