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.

Contraintes

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

Exemples

Entrée :
numbers = [2, 4, 6]

Sortie attendue :
expected = 4.0

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

Sortie attendue :
double expected = 4.0;

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

Sortie attendue :
double expected = 4.0;

Entrée :
numbers = [1, 2]

Sortie attendue :
expected = 1.5

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

Sortie attendue :
double expected = 1.5;

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

Sortie attendue :
double expected = 1.5;

Références

Ce défi a été adapté pour CodeUtility. Suivez l'énoncé et les contraintes ci-dessus.

• UW TCSS 142 Introduction to Programming - master syllabus