Question

the mean weight of a group of 15 boys is 65 kg . one boy joins the group and his weight is 45 kg . what is the average weight of all the boys​

Answer 1

63.75 kg

Explanation:

First of all, find the total weight of the 15 boys. you then add the weight of the new boy and divide by 16

Let the total weight of the 15 boys be x

x / 15 = 65 kg

To find the total, multiply 65 kg by 15 which is equal to 975kg

The total weight of the sixteen boys = 975 + 45 = 1020 kg

Average weight of all the boys = 1020 ÷ 16 = 63.75 kg

Answer 2

Explanation:

let the total weight of 15 boys is x

x/15=65

x=975

now one more boy joins the group whose weight is 45 kg

975+45/16=1020/16

the average weight of all boys is 63.75