Multiple choice

The average marks of 24 students of a class in maths is 56. If the marks of three students was mistakenly read as 44, 45 and 61 in place of 48, 59 and 67, then what is the correct average? 24 छात्रों की एक कक्षा के अंग्रेजी विषय के औसत अंक 56 है | यदि तीन विद्यार्थियों के अंक गलती से 44, 45 और 61, जबकि उनके वास्तविक अंक क्रमशः 48, 59 और 67 थे, तो सही औसत कितना होगा ?

  1. 57

  2. 55

  3. 57.5

  4. 58.5
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A Correct answer
Explanation

Current total marks = 56 × 24 = 1344. The mistaken marks total 44 + 45 + 61 = 150. The correct marks total 48 + 59 + 67 = 174. The difference is 174 - 150 = 24. Correct total = 1344 + 24 = 1368. Correct average = 1368 ÷ 24 = 57.

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