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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 11
Q11.  The mean of 12, 22, 32, 42, 52, 62, 72 is :
Question 12
Q12.  The average of a non-zero number and its square is 5 times the number. The number is :
Question 13
Q13.  The average of 7 consecutive numbers is 20. The largest of these numbers is :
Question 14
Q14.  The average of 5 consecutive odd numbers is 61. What is the difference between the highest and lowest numbers ?
Question 15
Q15.  The average age of the boys in a class is 16 years and that of the girls is 15 years. The average age for the whole class is :

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