list WSQ7

#include <iostream>
#include <cmath>
using std::cout;
using std::cin;
using std::endl;
float total(float array[],int size){
    float sum = 0.0;
    for (int i=0;i<size;i++){
    sum=sum+array[i];
    }
    return sum;
}
float average(float array[], int size){
    float avg=total(array,size);
    avg= avg/size;
    return avg;
}
float derivation(float array[],int size){
    float derivation = 0.0;
    float avg = average(array,size);
    for (int i=0;i<size;i++){
      derivation=derivation+((array[i]-avg)*(array[i]-avg));
    }
    return derivation;
}
float standardderivation(float array[],int size){
    float std;
    std=sqrt((derivation(array,size))/size);
    return std;
}

int main(){
    float array [10];
    for(int i=0;i<10;i++){
      cout << "Please enter a number" << endl;
      cin >> array[i];
    }
    cout << "the sum of those numbers is: " << total(array,10) << endl;
    cout << "the standard derivation of those numbers is: " << standardderivation(array,10) << endl;
    cout << "the average of those numbers is: " << average(array,10) << endl;
    return 0;
}