The average marks of Ravi in five subjects are 150. But in mathematics 43 was misread as 23 during the calculation. The correct average is:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e 154
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Understanding Tricks |
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Application Actual average = [{Number × Average ± (Difference in mistake)}/Number] [take + when the mistake number is less than the actual number take - when the mistake number is more than the actual number] = [{5 × 150 + (43 - 23)}/5] = (750 + 20)/5 = 770/5 = 154 |