statistics.hpp

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#pragma once
 
#include <cmath>
#include <cstddef>
#include <vector>
 
namespace mathematics::statistics {
 
    auto get_average(const double numbers[], int length) -> double;
 
    auto factorial(size_t n) -> size_t;
 
    auto combinations(size_t n, size_t k) -> size_t;
 
    auto variance(const std::vector<double> &data) -> double;
 
    auto probability(size_t favorable_outcomes, size_t total_outcomes) -> double;
 
    auto conditional_probability(size_t a_and_b, size_t b) -> double;
}  // namespace mathematics::statistics