For this project I have take in 5 scores and output the lowest, highest, and average scores, with the scores being between the numbers 0-10

Question

I have to take 5 different scores from 5 different judges and compute the average, lowest, and highest scores for this assignment. I have most of my code; however, I'm having trouble setting up the 'double getJudgeData(string jname)' function because I cannot change any of the functions given to me by my instructor, otherwise, I would use (double &score). In addition, when I try to add the scores for average_sc in the 'double average_sc' function (before the subtraction) I'm getting an error saying "too few arguments in the function call." How would I go about fixing it?

#include <iostream>
#include <iomanip>
using namespace std;
double getJudgeData(string jname);
double getAverage(double score1, double score2, double score3, double score4, double score5);
double getLowest(double score1, double score2, double score3, double score4, double score5);
double getHighest(double score1, double score2, double score3, double score4, double score5);
int main()
{
    //variables
    double score1, score2, score3, score4, score5, average_sc, lowest_sc, highest_sc;

    // Get input from five judges
    score1 = getJudgeData("Judge 1");
    score2 = getJudgeData("Judge 2");
    score3 = getJudgeData("Judge 3");
    score4 = getJudgeData("Judge 4");
    score5 = getJudgeData("Judge 5");

    average_sc = getAverage(score1, score2, score3, score4, score5);
    lowest_sc = getLowest(score1, score2, score3, score4, score5);
    highest_sc = getHighest(score1, score2, score3, score4, score5);

    cout << "Enter data entry for Judge 1: " << endl;

    return 0;
}
double getJudgeData(string jname)
{
    do
    {
        cout << "Data entry for Judge 1. \nScore must be in the range 0-10" << endl;
        cin >> jname;

        if (jname < 0 || jname > 10)
        {
            cout << "\nInvalid. Input must be 0-10. Please re-enter score" << endl;
        }

    } while (jname < 0 || jname > 10);
}
double getAverage(double score1, double score2, double score3, double score4, double score5)
{
    double lowest_sc,
        highest_sc,
        average_sc;

    // find lowest
    lowest_sc = getLowest(score1, score2, score3, score4, score5);

    // find highest
    highest_sc = getHighest(score1, score2, score3, score4, score5);

    // find/calculate average
    average_sc = getAverage(score1, score2, score3, score4, score5) - (highest_sc - lowest_sc) / 3;

    cout << setprecision(3) << "Average: " << average_sc << endl;
    cout << setprecision(3) << "Lowest: " << lowest_sc << endl;
    cout << setprecision(3) << "Highest: " << highest_sc << endl;

    return average_sc;

}
double getLowest(double score1, double score2, double score3, double score4, double score5)
{
    if (score1 < score2 && score1 < score3 && score1 < score4 && score1 < score5)
    {
        return score1;
    }
    else if (score2 < score1 && score2 < score3 && score2 < score4 && score2 < score5)
    {
        return score2;
    }
    else if (score3 < score1 && score3 < score2 && score3 < score4 && score3 < score5)
    {
        return score3;
    }
    else if (score4 < score1 && score4 < score2 && score4 < score3 && score4 < score5)
    {
        return score4;
    }
    else
    {
        return score5;
    }
}
double getHighest(double score1, double score2, double score3, double score4, double score5)
{
    if (score1 > score2 && score1 > score3 && score1 > score4 && score1 > score5)
    {
        return score1;
    }
    else if (score2 > score1 && score2 > score3 && score2 > score4 && score2 > score5)
    {
        return score2;
    }
    else if (score3 > score1 && score3 > score2 && score3 > score4 && score3 > score5)
    {
        return score3;
    }
    else if (score4 > score1 && score4 > score2 && score4 > score3 && score4 > score5)
    {
        return score4;
    }
    else
    {
        return score5;
    }
}