There are 10 boys and 20 girls in a class. The class has a test. The mean mark for all the class is 60. The mean mark for the girls is 54. Work out the mean mark for the boys.

Mean = Sum of all the numbers/How many numbers there are60=sum of all numbers/30 therefore 1800= sum of all the test scores of class54= sum of all the girls' scores/20 therefore 1080 = sum of all the girl's test scoreTo calculate sum of all the boy's test score 1800-1080 = 720x=720/10 therefore x=72 therefore mean score for boys = 72

Answered by Chimdi O. Maths tutor

6696 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Expand the brackets? (x+4)(2x-3)


Solve x^2 = 4(x - 3)^2


Expand the brackets (2x + 3)(3x - 1)


For the equation, 5(7x + 8) + 3(2x + b) ≡ ax + 13. Find the values of a and b. You may use a calculator.


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo
Cookie Preferences