1.write a function that computes the average and standard deviation of four scores. the standard deviation is defined to be the square root of the average of the four values: (si – a)2, where a is average of the four scores s1, s2, s3, and s4. the function will have six parameters and will call two other functions. embed the function in a driver program that allows you to test the function again and again until you tell the program you are finished.