The mean weight of 7 boys in a class is 78 kilograms. Two boys have been added to the class. The mean weight of the two boys is 42 kilograms and one new boy weighs 50 kilograms. Calculate the weight of the 9th boy and the NEW mean weight of all of the boys.
Answers
Answered by
1
Step-by-step explanation:
mean of 7 boys = 78kg
sum of 7 boys = 78 ×7 = 546
mean of 2 boys = 42
sum of 2 boys = 42×2 =84 kg
one boy = 50 kg
sum of weights of 10 boys = 546+84+50=680
mean of weights of 10 boys = 680/10=68 kgs
Similar questions