the average height of child in a group of 1 m 10 cm . if the 6th child's height is 1 m 40 cm, find the new average of a child in a group of 6
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Step-by-step explanation:
Total height of 10 students =10×105=1050cm
Total height of 20 students =20×120=2400cm
∴ total height of 30 students =1050+2400=3450
Hence average height of 30 students =
30
3450
=115cm
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