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Aptitude ➤ Averages ➤ Set 2
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 6
Q6.  The average of 2, 7, 6 and x is 5 and the average of 18, 1, 6, x and y is 10. What is the value of y ?
Question 7
Q7.  If the mean of 5 observations x, x+2, x+4, x+6 and x+8 is 11, then the mean of the last three observations is :
Question 8
Q8.  If the mean of a, b, c is M and ab + bc + ca = 0, then the mean of a2, b2, c2 is :
Question 9
Q9.  The average of the two digit numbers, which remain the same when the digits interchange their positions is :
Question 10
Q10.  The average of first 50 natural numbers is :

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