The average height of a class students is 134.7 cm. The sum of all the heights...
The average height of a class students is 134.7 cm. The sum of all the heights is 3771.6 cm. There are 17 boys, how many girls?
Homework Answers
Solution :
Mean = sum of scores/number of scores
134.7 = 3771.6/(x+17)
134.7(x+17) = 3771.6
134.7x + 2289.9 = 3771.6
134.7x = 3771.6 - 2289.9
134.7x = 1481.7
x = 1481.7/134.7
x = 11
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