Question

In a group of four children, their mean height is 1.40m. 1n another group of six children, their mean height is 1.60m. Work out the mean height of all ten children.

Answer 1

No. of children= 4

Mean height= 1.40 m

2nd group

No. of children= 6

Mean height= 1.60m

Mean height of all 10 children = 1.60 + 1.40m = 3.0 m

Answer 2

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Mean = total / Number

Total = Mean * Number

Total Height of 4 children = 1.4 × 4 = 5.6 m

Total Height of 6 children = 1.6 × 6 = 9.6 m

Total Height of 10 children = 5.6 + 9.6 = 15.2 m

Mean of 10 children = 15.2 / 10 = 1.52