Register
There are 30 students in a year 10 maths class. In the latest test the 21 girls in the class score a mean of 61%. In the same test the 9 boys in the class scored a mean of 78%. Calculate the mean for the
172k views
0 votes
There are 30 students in a year 10 maths class. In the latest test the 21 girls in the class score a mean of 61%. In the same test the 9 boys in the class scored a mean of 78%. Calculate the mean for the whole group of students.

User GAMELASTER
by
7.3k points

1 Answer

7 votes
Total score of the 21 girls = 61*21 = 1281
Total score of 9 boys = 78*9 = 702

Mean for all 30 students = (1281+702) / 30 = 1983 / 30 = 66.1 % (answer)
User SGR
by
8.1k points
← Prev Question Next Question →

Related questions

User Trav
asked Jan 6, 2024 80.3k views
Calculate the mass percent of water for the hydrate LiNO 3⋅3H 2O. A) 14.61% B) 25.78% C) 38.96% D) 42.37%
Trav asked Jan 6, 2024
by Trav
8.1k points
1 answer
0 votes
80.3k views
Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.5m questions

12.2m answers

Other Questions

How do you can you solve this problem 37 + y = 87; y =
What is .725 as a fraction
i have a field 60m long and 110 wide going to be paved i ordered 660000000cm cubed of cement  how thick must the cement be to cover field
Write words to match the expression. 24- ( 6+3)
A dealer sells a certain type of chair and a table for $40. He also sells the same sort of table and a desk for $83 or a chair and a desk for $77. Find the price of a chair, table, and of a desk.
Link Copied!