Question

The mean height of 9 boys and 7 girls is 162.63 cm.If the mean height of the 7 girls is 166 cm,find the mean height of the 9 boys

Answer 1

Answer:

160.01

Step-by-step explanation:

Sum of observations/ number of observations =mean

total students=16

Number of boys = 9

Number of girls= 7

mean height of 16 students= 162.63 cm

Sum of heights of the 16 students= 2602.08 cm ----(1)

Mean. Height of 7 girl = 166 cm

Sum of heights of 7 girls = 166×7=1162 ----(2)

Sum of the heights of 9 boys = (1) - (2)

= 2602.08-1162

= 1440.08

Mean height of 9 Boys = 1440.08/9

= 160.008889

= 160.01

Answer 2

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Here is your answer
The mean height of 9 boys and 7 girls (16 numbers) = 162.63 cm

As we know that
Mean = Sum of Number/Total numbers

Hence
Sum of 16 boys and girls Height = 16 × 162.63
= 2602.08

Now,
Mean of 7 girls height = 166 cm

Sum of 7 girls height = 166 × 7
= 1162

Sum of 9 boys height = Sum of 16 boys and girls Height - Sum of 7 girls Height
= 2602.08 - 1162
= 1440.08

Mean of 9 boys height = 1440.08/9
= 160.0088
= 160 cm


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