Correct Answer - Option 1 : 59.5 kg
Given:
Average weight of 20 students = 60 kg
Concept used:
Average is the central value of a given set of values.
Formula Used:
Average = (Sum of Values/Number of Values)
Calculation:
As, the sum of weight of 20 students = 60 kg
Sum of the weight of 20 students = 20 × 60 = 1200 kg
As, it was later discovered that one weight was misread as 80 kg instead of 70 kg.
⇒ Difference = 80 - 70 = 10 kg
Actual sum of the weight of 20 students = 1200 - 10 = 1190 kg
Actual average = 1190/20 = 59.5 kg
∴ The correct average is 59.5 kg.