The average age of 30 students is 15 years. It was observed that while calculating the average age, the age of a student was taken as 15 years instead of 9 years. What will be the correct average age ?
Answer & explanation
Correct answer: option 4
Sum of ages of 30 students = 30 x 15 = 450
Sum of ages after correction = 450 - 15 + 9 = 444
Correct average = \(\frac{444}{30}\) = 14.8 years