Hard Average Methods shortcut tricks

Hard Average Methods shortcut tricks

Example 1: The average marks in Mathematics of a class V of 28 students is 58. The marks of students if were wrongly read as 36, 46,37 of the existing marks 42, 59, 66 respectively. then find the correct average ?
Answer : Shortcut :
28 x 58 (42 + 59 + 66) -(36 + 46 + 57) / 28 = 59
The correct average is 59.

 

 

 

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