Question

5 female giraffes have a mean weight of x kg

7 male giraffes have a mean weight of y kg
Write down an expression, in terms of x and y, for the mean weight of all the giraffes.

Answer 1

Explanation:

Weight of all female giraffes = 5x kg

Weight of all male giraffes = 7y kg

Mean weight of all giraffes

`= (5x + 7y)/(5 + 7) \\ \\ = (5x + 7y)/(12) \: kg`