Average Aptitude Set 7
31) Find the average of first 20 consecutive natural numbers.
- 12.20
- 10.78
- 16.45
- 10.5
Answer: D
Explanation:
The average of first n consecutive natural numbers is given by;
=(n+1)/2
Here, n=20
So, average = (20+1)/2
=210/20
=21/2
=10.5
32) Find the average of square of first 5 consecutive natural numbers.
- 12
- 10
- 16
- 11
Answer: D
Explanation:
The average of square of first n consecutive natural numbers is given by;
= (n+1) (2n+1) / 6
Here, n=5
= (5+1) (2*5+1)/6
= 6*11/6
= 11
33) Find the average of cubes of first 7 consecutive natural numbers.
- 112
- 110
- 116
- 113
Answer: A
Explanation:
The average of cubes of first n consecutive natural numbers is given by;
= n (n+1)²/4
Here, n=7
= 7 (7+1)²/4
= 7*64/4
=448/4
= 112
34) Find the average of first 8 consecutive odd numbers.
- 11
- 10
- 8
- 12
Answer: C
Explanation:
The average of first n consecutive odd numbers is equal to n, so the average of first 8 consecutive odd numbers is 8.
You can check by solving it as show below:
= (1+ 3+ 5+ 7+ 9+ 11+ 13+ 15)/8
= 64/8 = 8
35) Find the average of the square of first 5 consecutive odd numbers starting from 1 to 9, where the last odd number is 9.
- 22
- 11
- 16
- 33
Answer: D
Explanation:
The average of square of first n consecutive odd numbers starting from 1 to X, where the last odd number is X, is given by:
=X(X+2)/3
Here, X=9
So, average =9(9+2)/3
=9*11/3
=99/3
=33
Read More
Average Aptitude Set 1
Average Aptitude Set 2
Average Aptitude Set 3
Average Aptitude Set 4
Average Aptitude Set 5
Average Aptitude Set 6
Average Aptitude Set 7
Average Aptitude Set 8
Average Aptitude Concepts
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