Find the average of the cubes of the first five natural numbers.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 45
Formula used
The average of cubes of n natural numbers = n * [(n + 1)/2]2
Calculation
The average of the cubes of first 5 natural numbers = 5 * [(5 + 1)/2]2
= 5 * 9 = 45