Math, asked by ethantv1234, 5 months ago

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 bson

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

Previous Question

Next Question

Similar questions

Math, 2 months ago

verify that the numbers given alongside of the cubic polynomials below are their zeroes. also, verify the relationship between the zeroes and the coefficients in each case 1x^3+x^2-5x+2 ; 4,1,-2...

Math, 2 months ago

A can do a piece of work in 6 days and B can do the same work in 12 days. How many days will they take to do it together?

English, 2 months ago

1. Which one of the following aspects is essential for education? (a) Good choice (b) Imposed choice (c) Wild choice.

Social Sciences, 5 months ago

Why was Subsidiary Alliance introduced by lord Wellesley and when ?

Science, 5 months ago

What makes a heterogeneous mixture different from a homogeneous mixture? (4 points) A-The components are mixed unevenly instead of evenly within the heterogenous mixture. B-Insoluble instead of soluble particles are suspended within the heterogenous mixture. C-Two liquids that normally are not mixable are mixed in a heterogeneous mixture. D_The components within a heterogeneous mixture are...

Math, 11 months ago

helloo..........answer this........

Physics, 11 months ago

what do u tell about oumuamua??? is that a space ship or not???

English, 11 months ago

what is pronoun ??????????????