"Véletlen" lenne, vagy van rá logikus magyarázat is?

double Mean(const std::vector<double>& v)

{

return std::accumulate(v.cbegin(), v.cend(), 0.0) / v.size();

}

double Foo1(const std::vector<double>& v)

{

double mean = Mean(v);

double result = 0.0;

for (const auto& i : v)

{

result += std::abs(mean - i);

}

return std::sqrt(result/=v.size());

}

double Foo2(const std::vector<double>& v)

{

double mean = Mean(v);

double result = 0.0;

for(const auto& i : v)

{

result += std::pow(mean - i, 2);

}

return std::sqrt(result /= v.size());

}

int main()

{

std::vector<double> v = {6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8,8,9,9,9,10};

std::cout << Foo1(v) << '\n'; // 0.840635

std::cout << Foo2(v) << '\n'; // 0.840635

std::getchar();

return 0;

}