Multiple choice

The average marks obtained by 20 students was calculated to 35. Further it was found that the marks of one student was wrongly read as 45 instead of 85. The correct average is- एक कक्षा में 20 विद्यार्थियों का औसत अंक 35 ज्ञात किया जाता है लेकिन बाद में यह पाया जाता है कि एक बच्चे के अंक 85 के स्थान पर 45 पढ़ लिये जाते हैं, तो सही औसत है-

  1. 37

  2. 33

  3. 33.5

  4. 37.5
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A Correct answer
Explanation

The difference in marks is 85 - 45 = 40. This difference should be distributed among 20 students, so the correction to the average is 40/20 = 2. The correct average is 35 + 2 = 37.

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