Define a function named average_grade. This function returns a double and has four double arguments, test1, test2, test3, test4. The return value should be the average, or arithmetic mean of the four arguments. Be sure to include a comment that tells briefly what the function does.

What will be an ideal response?

// returns arithmetic mean of the arguments test1 - test4
double average_grade (double test1-, double test2,
double test3, double test4)

{
double average;
average = (test1 + test2 + test3 + test4) / 4;
return average;