/*
                      テスト1,テスト2,テスト3
    被検者 A の得点  :  80 点,  90 点,  75 点
    被検者 B の得点  :  30 点,  30 点,  25 点
    被検者 C の得点  :  90 点, 100 点,  90 点
*/
#include <math.h>
#include <stdio.h>

int  main(void)
{
    float  fMean_of_1, fVar_of_1, fSD_of_1;
    float  fMean_of_2, fVar_of_2, fSD_of_2;
    float  fMean_of_3, fVar_of_3, fSD_of_3;

    fMean_of_1 = ( 80.0 + 30.0 + 90.0  ) / 3.0;
    fVar_of_1=(( 80.0 - fMean_of_1) * (80.0 - fMean_of_1) +
                (30.0 - fMean_of_1) * (30.0 - fMean_of_1) +
                (90.0 - fMean_of_1) * (90.0 - fMean_of_1) ) 
                 / 3.0;
    fSD_of_1 = sqrt( fVar_of_1 );

    fMean_of_2 = ( 90.0 + 30.0 + 100.0 ) / 3.0;
    fVar_of_2=((90.0 - fMean_of_2) * (90.0 - fMean_of_2) +
               (30.0 - fMean_of_2) * (30.0 - fMean_of_2) +
               (100.0 - fMean_of_2) * (100.0 - fMean_of_2)) 
                / 3.0;
    fSD_of_2 = sqrt( fVar_of_2 );

    fMean_of_3 = ( 90.0 + 100.0 + 90.0 ) / 3.0;
    fVar_of_3=((75.0 - fMean_of_3) * (75.0 - fMean_of_3) +
               (25.0 - fMean_of_3) * (25.0 - fMean_of_3) +
               (90.0 - fMean_of_3) * (90.0 - fMean_of_3)) 
               / 3.0;
    fSD_of_3 = sqrt( fVar_of_3 );

    printf( " Mean, variance, and S.D of test 1 are \n" );
    printf( "%f, ", fMean_of_1 );
    printf( "%f, ", fVar_of_1 );
    printf( "%f,\n", fSD_of_1 );

    printf( " Mean, variance, and S.D of test 2 are \n" );
    printf( "%f, ", fMean_of_2 );
    printf( "%f, ", fVar_of_2 );
    printf( "%f,\n", fSD_of_2 );

    printf( " Mean, variance, and S.D of 3 are \n" );
    printf( "%f, ", fMean_of_3 );
    printf( "%f, ", fVar_of_3 );
    printf( "%f.\n", fSD_of_3 );

    return 0;
}