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Problem · Array

Average or Zero

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Problem statement

Given a numeric array table, return its arithmetic mean.

The arithmetic mean is the sum of all values divided by the number of values. If table is empty, return 0.

Function

average(table: double[]) → double

Examples

Example 1

table = [2,4,6,8]return = 5.0

The values sum to 20. Dividing by the 4 values gives 5.

Example 2

table = []return = 0.0

The input is empty, so the required result is 0.

Example 3

table = [-1.5,2.5,5]return = 2.0

The values sum to 6. Dividing by the 3 values gives 2.