In a class out of 90 students, the 60% are girls and the rest of boys. If the…
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In a class out of 90 students, the 60% are girls and the rest of boys. If the average marks of girls is 62 and average marks of boys is 70, then find the average of all the students in the class.
- A.
62.2
- B.
67.6
- C.
68.4
- D.
65.2
Attempted by 20 students.
Show answer & explanation
Correct answer: D
Given
Total student = 90
Average marks of girls = 62
Average marks of boys = 70
Formula used
Average = Sum of Data/Number of data
Calculation
Girls in the class = 60% of 90 = 54
Boys in the class = 90 - 54 = 36
Average of all student = [54 × 62 + 36 × 70]/90
⇒ 5868/90 = 65.2
∴ The average marks of all student is 65.2