/* Header file "statistics.h" */

/* used in Example answer, Exercise 3, Sheet 3  */

/* Author: Rob Miller
   Program last changed: 23nd August 1996 */

#ifndef STATISTICS_H

/* (no constant or type definitions) */

/* FUNCTION TO CALCULATE AVERAGE OF ONE NUMBER */
double average(double no_1);

/* FUNCTION TO CALCULATE AVERAGE OF TWO NUMBERS */
double average(double no_1, double no_2);

/* FUNCTION TO CALCULATE AVERAGE OF THREE NUMBERS */
double average(double no_1, double no_2, double no_3);

/* FUNCTION TO CALCULATE AVERAGE OF FOUR NUMBERS */
double average(double no_1, double no_2, double no_3, double no_4);

/* FUNCTION TO CALCULATE STANDARD DEVIATION OF ONE NUMBER */
double standard_deviation(double no_1);

/* FUNCTION TO CALCULATE STANDARD DEVIATION OF TWO NUMBERS */
double standard_deviation(double no_1, double no_2);

/* FUNCTION TO CALCULATE STANDARD DEVIATION OF THREE NUMBERS */
double standard_deviation(double no_1, double no_2, double no_3);

/* FUNCTION TO CALCULATE STANDARD DEVIATION OF FOUR NUMBERS */
double standard_deviation(double no_1, double no_2, double no_3, double no_4);


#define STATISTICS_H
#endif