Question

the mean maeks of 100 boys in a class are 45.the mean marks of entire class of 150 students are 50.find mean marks of the remaining group of girls.​

Answer 1

Answer:

Mean marks of 50 girls = 60

Step-by-step explanation:

The mean marks of 100 boys = 45

Total marks of 100 boys = 45 × 100

                                        = 4500

Mean marks of 150 students = 50

Total marks of 150 students = 50 × 150

                                               = 7500

Total marks of 50 girls = Total marks of 150 students - Total marks of 100 boys

                                      = 7500 - 4500

                                      = 3000

Mean marks of 50 girls = $\dfrac{Total \ marks \ of \ 50 girls}{50}$

                                       = $\dfrac{3000}{50}$

Mean marks of 50 girls = 60