The average of 10 numbers is calculated as 15. It is discovered

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The average of 10 numbers is calculated as 15. It is discovered later on that while calculating the average one number, namely 36, was wrongly read as 26. The correct average is

1. 20
2. 18
3. 16
4. 14

Correct Option: C

Here , The average of 10 numbers = 15 .
While calculating the average one number, namely 36, was wrongly read as 26 ,
Correct total of 10 numbers = 15 × 10 – 26 + 36 = 160

∴ Correct average =	160	= 16
	10

Second method to solve this question with the help of given formula :
Here, n = 10, m =15 , a = 36, b = 26

Correct Average = m +	(a - b)
	n

Correct Average = 15 +	(36 - 26)	= 15 + 1 = 16
	10