Array Average

Return the arithmetic mean of the list: its sum divided by its length, as a decimal number.

Implement array_average(numbers).

Input

numbers: A non-empty list of integers.

Output

Return the average.

Vincoli

1 ≤ length ≤ 100,000; -10⁹ ≤ each value ≤ 10⁹

Esempi

Input:
numbers = [2, 4, 6]

Output atteso:
expected = 4.0

Input:
std::vector<long long> numbers = {2, 4, 6};

Output atteso:
double expected = 4.0;

Input:
long[] numbers = new long[] {2, 4, 6};

Output atteso:
double expected = 4.0;

Input:
numbers = [1, 2]

Output atteso:
expected = 1.5

Input:
std::vector<long long> numbers = {1, 2};

Output atteso:
double expected = 1.5;

Input:
long[] numbers = new long[] {1, 2};

Output atteso:
double expected = 1.5;

Riferimenti

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• UW TCSS 142 Introduction to Programming - master syllabus