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. Mean of 10 numbers is 30. Later on it was observed that numbers 15,23 are wrongly taken as 51,32. The correct mean is :
