The average of 27 numbers is 60. If one number is changed from 28 to 82, the average is
Options:
A . 58
B . 56
C . 64
D . 62
Answer: Option D Answer: (d)Difference of numbers = 82 – 28 = 54 ∴ Required average = 60 + $54/27$ = 62 Aliter : Using Rule 26, If average of n numbers is m later on it was found that a number 'a’ was misread as 'b’. The correct average will be = m +${\text"(a-b)"}/ \text"n"$.Here, n = 27, m = 60 b = 28, a = 82 New Average = m + ${\text"(a - b)"}/\text"n"$ = 60 +${(82 - 28)}/27$= 60 +$54/27$ = 62
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