Mean = sum of scores/number of scores
134.7 = 3771.6/(x+17)
Solve for x. Hint: start by multiplying both sides by x+17.
I hope this helps. Thanks for asking.
The average height of a class of students is 134.7cm. The sum of all the heights is 3771.6 cm. There are 17 boys in the class. How many girls are in the class?
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