Average of 50 numbers was calculated as 20 when three numbers, 26, 36 and 64 were wrongly read as 31, 46 and 59 respectively. What is the correct average?
Answer & explanation
Correct answer: option 2
Difference in sum due to wrong entry =( 28 + 36 + 64) - ( 31 + 46 + 59)
= -8
Correct average = 20 - \(\frac{8}{50}\) = 19.84
= 19.8