2. Write a piece of C code that reads from Num.txt provided. a. Write a function to multiply the elements of the array by 2. b. Find the mean and standard deviation of the data after doubling. C. Output that information to a file called "Mean_Std.dat". Use the code snippet below to read the file: #include #include int main() FILE *fp; fp = fopen ("Num_2.txt","r"); float arr [500]; if(fp==NULL) {printf("Error opening file! ");exit(1); } int i; int count; count =0; for(i=0; i