Multiple choice

A class of 25 students has an average test score of 72. If the scores of the top 5 students are 90, 88, 85, 84, and 82, what is the mean score of the remaining 20 students?

  1. 66.45

  2. 68.55

  3. 70.20

  4. 71.15
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B Correct answer
Explanation

Total score of 25 students = 25 * 72 = 1800. Sum of top 5 scores = 90 + 88 + 85 + 84 + 82 = 429. Sum of remaining 20 students = 1800 - 429 = 1371. Mean of remaining 20 = 1371 / 20 = 68.55.

AI explanation

The total score for all 25 students is 25 * 72 = 1800. The sum of the top 5 scores is 90 + 88 + 85 + 84 + 82 = 429. The sum of the remaining 20 scores is 1800 - 429 = 1371. The mean score of these 20 students is 1371 / 20 = 68.55.

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