Multiple choice

The mean marks scored by $40$ students were found to be $60$. Later it was observed that a score of $48$ was misread as $84$. Then the correct mean is __________.

  1. $58$
  2. $58.2$
  3. $59.1$
  4. $59$
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C Correct answer
AI explanation

The original total sum of the 40 scores is 40 times 60, which equals 2400. The correct total sum is found by subtracting the misread score and adding the actual score, giving 2400 minus 84 plus 48, which equals 2364. The correct mean is the new total divided by 40, so 2364 divided by 40 is 59.1.

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