Problem with 2D array

I don't understand logically what is causing this too happen, but the "Dropped Grade" & "Average" are always coming out as "-858993460" & "286331275.00".

The program is suppose to have you enter 4 scores then find the lowest score & then calculate the average & then display the lowest score & average. Then it loops back and starts on a new student and repeats the process 3 times, but the outcomes of average & lowest come out all wrong.

If someone could please explain what logically is going wrong that would be great & what I should do differently.

Code:

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#include<iostream>
#include<iomanip>
using namespace std;

void getData(int score[][4], int rows, int &low, double &avg)
{
        for(int R=0; R < rows; R++)
        {
                int TOT=0;
                low = score[R][0];

                for(int C=0; C < 4; C++)
                {
                        do
                        {
                                cout << "Enter test score " << (C+1) << " for student " << (R+1) << ": ";
                                cin >> score[R][C];
                        }while(score[R][C] < 0 || score[R][C] > 100);

                        TOT += score[R][C];

                        if (score[R][C] < low)
                                low = score[R][C];
                }

                avg = (TOT - low) / 3.0;

                cout << fixed << setprecision(2);
                cout << endl;
                cout << "Dropped Grade: " << low << endl;
                cout << "Average: " << avg << endl;
        }
}

int main()
{
        int sc[3][4], low;
        double avg;

        getData(sc, 3, low, avg);
        return 0;
}

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One thing that catches the idea is that low is set to an uninitialized value.

Code:

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low = score[R][0];

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One possibility, since 100 is the maximum score, is low = 100.