Challenge 1: Average of Numbers

Problem Statement

Implement a function that computes the average of all the numbers in an array.

If we have $n$ numbers and each number is denoted by $a_i$ $(where \: i = 0, 1, 2, ..., n-1)$, the average is the $sum$ of the numbers divided by $n$. This is represented as follows:

$${\displaystyle average={\frac {1}{n}}\sum _{i=0}^{n-1}a_{i}={\frac {a_{0}+a_{1}+a_{2}+\cdots +a_{n-1}}{n}}}$$

Try solving this problem recursively.

Input

1. A testVariable containing an array of numbers.
2. The currentIndex of the array.

Note: The array, testVariable, can’t be empty, i.e., it will always have at least one element.

Output

Average of all numbers in the input array.

Sample Input

testVariable = [10, 2, 3, 4, 8, 0] 
currentIndex = 0

Sample Output

4.5

Try it Yourself

Try this challenge yourself before examining the solution. Good luck!