The average of five consecutive odd numbers is m. If the next three odd numbers are also included, then what is the increase in the average?
Answer & explanation
Correct answer: option 1
Five consecutive odd numbers are 1, 3, 5, 7, 9
Average of five consecutive odd number = \(\frac{1 + 3 + 5 + 7 + 9}{5}\) = 5
So m = 5
If next three odd number are included, then average of 8 consecutive odd number = \(\frac{25 + 11 + 13 + 15}{8}\)
⇒ 8
Increase in average = 8 - 5 = 3