A school has four grades. The average marks in Grade 9, Grade 10, Grade 11 and Grade 12 are 65, 70, 70 and 74 respectively. The number of students in each corresponding grade is 40, 45, 35 and 50 respectively. What is the weighted arithmetic mean score for all students across all grades?
Subject: Mathematics | Topic: Statistics | Difficulty: MEDIUM
Options
- (A) 69
- (B) 70
- (C) 73
- (D) 68
Verified Answer
Option (B): 70
Practice complete mock tests for SSC, Banking & Railway exams at https://testx.in/questions/01a0bfae-d1d7-7cfd-958c-aca2dfef0933/a-school-has-four-grades-the