Question

Develop a C-code to calculate average, median and standard deviation, using 5 numbers as data you input from the keyboard from calculations and compare program output with the hand calculations shown with formula for average, median & standard deviation..

Use suggested approach below for developing the code (other approaches are also possible):

In main     define an array of size = 5,

Read in 5 decimal numbers and print the chosen numbers for input; Store input as a array and work with the array only;

define a pointer pointing to the beginning of an array,

pass the array using pointer to function to function_average to compute ‘average’ that is passed back to main;

pass the array using pointer to function to function_median to compute ‘median’ that is passed back to main;

pass the array using pointer to function_standard_derivation to compute ‘standard deviation’ that is pass bac to main;

print results of the computed ‘average’, ‘median’ and ‘standard deviation’ with words of

‘Average of the input five numbers are’, ‘Median of the input five numbers is’ and ‘Standard Deviation of the input five numbers is”

Create function_average

Create function_median,

Create function_standard_derivation

Answer 1

the code is given below

#include<stdio.h>

#include<math.h>

int main() {

double a,b,c,d,e; // Define 5 variables

double avg ,mean,sd; // define average , Mean, standard deviation

printf("Enter five numbers: \n");

scanf("%lf",&a);

scanf("%lf",&b);

scanf("%lf",&c);

scanf("%lf",&d);

scanf("%lf",&e);

int a1,b1,c1,d1,e1;

a1 = (int)a;

b1 = (int)b;

c1 = (int)c;

d1 = (int)d;

e1 = (int)e;

printf("\n\nData: %d %d %d %d %d\n",a1,b1,c1,d1,e1);

avg = (a+b+c+d+e)/ 5.0;

mean = (a + b + c + d + e) / 5.0;

sd = sqrt(((pow(a-mean,2)) + (pow(b-mean,2)) + (pow(c-mean,2)) + (pow(d-mean,2)) + (pow(e-mean,2)))/ 5.0);

printf("Results: \n Average = %6.4f\n Mean = %6.4f\n Standard Deviation = %6.4f\n",avg,mean,sd);

return 0;

}

Sample output

Enter five numbers:                                                                               

42                                                                                                

44                                                                                                

142                                                                                               

144                                                                                               

143                                                                                               

                                                                                                  

                                                                                                  

Data: 42 44 142 144 143                                                                           

Results:                                                                                          

Average = 103.0000                                                                               

Mean = 103.0000                                                                                  

Standard Deviation = 48.9980

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