1.

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

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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