Multiple choice

In a Math`s test average score of 15 boys of a class is 84 and average score of 12 girls is 90. What is the average score of the class?

  1. 92.5

  2. 90.4

  3. 88.8

  4. 86.7

  5. 84.2
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D Correct answer
Explanation

Total score = (15 * 84) + (12 * 90) = 1260 + 1080 = 2340. Total students = 15 + 12 = 27. Average = 2340 / 27 = 86.666... which rounds to 86.7.

AI explanation

Using the method of combined averages, the total score of the boys is 15 multiplied by 84, which equals 1260. The total score of the girls is 12 multiplied by 90, which equals 1080. The combined total score for the whole class is 1260 plus 1080, resulting in 2340. The total number of students is 15 plus 12, which is 27. We divide the total score by the total number of students, so 2340 divided by 27 equals 86.7.

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