Average:
Average = Sum of observations / Number of observations
Average Speed :
Suppose a man covers a certain distance at x kmph and an equal distance at y kmph.
Then, the average speed druing the whole journey is [2xy/(x+y)] kmph.
Question 1
Q1. The average of 25 results is 18. The average of 1st 12 of them is 14 and that of last 12 is 17. Find the 13th result.
