Multiple choice

The average mark of 9 students in a group is 63. Three of them scored 78, 69 and 48 marks, respectively. What is the average mark of remaining 6 students?

  1. 63.5

  2. 62.5

  3. 63

  4. 62

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Total marks = 9 * 63 = 567. Sum of 3 students = 78 + 69 + 48 = 195. Sum of remaining 6 = 567 - 195 = 372. Average = 372 / 6 = 62.

AI explanation

The total marks for all 9 students is 9 multiplied by 63, which equals 567. The sum of the marks of the 3 specified students is 78 plus 69 plus 48, which equals 195. The total marks for the remaining 6 students are 567 minus 195, resulting in 372. The average for these 6 students is 372 divided by 6, which equals 62.