/* Read in 4 numbers from the screen, calculate their mean and
 * standard deviation, output this correct to 2 decimal points.  */

#include <stdio.h>
#include <stdlib.h>

int main (void) {
  double a, b, c, d;
  double mn, sd;
  printf("Enter the 4 numbers: ");

  /* BEGIN ANSWER -- do not delete this line   */

  // ADD YOUR CODE HERE

  /* END ANSWER -- do not delete this line  */
 
  return EXIT_SUCCESS;
}