The average of marks of 28 students in Mathematics was 50; 8 students left the school, then this average increased by 5. What is the average of marks obtained by the students who left the school ?
Options:
A . 37.5
B . 42.5
C . 50.5
D . 45
Answer: Option A Answer: (a)Total marks of 28 students = 28× 50 = 1400Total marks of 20 students = 20 × 55 = 1100∴Total marks of 8 students = 1400 – 1100 = 300∴ Average = $300/8$ = 37.5
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