Define a class called Statistical Data which manages a number of readings of type int. Provide a method to set Data available in the form of an array, a method add to individually add data of type int, a method to reset the entire data and methods to return mean, median, mode, variance, standard deviation, percentile, quartile, inter quartile range

[ Statistical_data.java ]

import java.io.*;

class Statistical_data

{

   int data[];

   Statistical_data()   

{

    data=new int[1];

   }

   void setdata(int value[]) 

{

    data=new int[value.length];      

    for(int i=0;i<data.length;i++)         

{

     data[i]=value[i];

    }

   }

   int add()  

{

    int sum=0,i;

    for(i=0;i<data.length;i++)        

{

     sum=sum+data[i];

    }

    return sum;

   }

   void reset()    

{

    for(int i=0;i<data.length;i++)         

{

     data[i]=0;

    }

    data=new int[1];

   }

   double mean()   

{

    return (double)this.add()/data.length;

   }

   double median() 

{

    int size,n=0;

    double median;

    size=data.length;

    this.sort();

   

    if (size%2 == 0)         

{        

     n=size/2 - 1 ;

     median=((double)data[n] + data[n+1])/2;

    }

    else      

{

     System.out.println("ODD" + size);

     n=(size)/2;

     median=data[n];

    }        

    return median;

   }

   double mode()  

{

    double mode;

    mode= ( (double)3*median() ) - ( 2*mean() );

    return mode;

   }

   double variance()    

{

    int size=data.length;

    double mean=this.mean(),sum=0;

    for(int i=0;i<size;i++)

    {

     sum=sum+Math.pow((data[i]-mean),2);

    }

    return sum/(size-1);

   }

   double standard_deviation()    

{

    return Math.sqrt(this.variance());

   }

   double percentile(int no)

{

    double perc=0;

    int size=data.length, temp;

   

    if(no<0 && no>100)      

{   

     System.out.println("Percentile should be more than 0 and less than 100..");

     perc=-1;

    }

    else     

{

     temp=(no*size)/100;

     if( temp == (double)(no*size)/100)             

{

          perc=(double)(data[temp]+data[temp-1])/2;

     }

     else          

{

          perc=(double)data[temp];

     }

    }

    return perc;

   }

   double quartile(int no)  

{

    double quart=0;

    int size=data.length, temp;

   

    if(no<1 && no>3)        

{   

     System.out.println("Quartile should be more than 1 and less than 3..");

     quart=-1;

    }

    else      

{

     if(no==1)

          no=25;

     else if(no==2)

          no=50;

     else

          no=75;

     temp=(no*size)/100;

     if( temp == (double)(no*size)/100)            

  {

          quart=(double)(data[temp]+data[temp-1])/2;

     }

     else          

{

          quart=(double)data[temp];

     }

    }

    return quart;

   }

   double IQR()   

{

    return this.quartile(3)-this.quartile(1);

   }

   void sort() 

{

    int temp,size;

    size=data.length;

    for(int i=0;i<size;i++)

    {

     for(int j=0;j<size;j++)

     {

          if(data[i]<data[j])

          {

              temp=data[i];

              data[i]=data[j];

              data[j]=temp;

          }

     }

    }

   }

}

class student{

   int rollno,marks[];

   String name;

   student()

   {

    marks=new int[6];

   }

   void getdata()  throws IOException

   {

    name=new String();

    BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

    System.out.println("Enter RollNo");

    rollno=Integer.parseInt(br.readLine());

    System.out.println("Enter Name");

    name=br.readLine();

    System.out.println("Enter Marks");

    for(int i=0;i<6;i++)

    {

     System.out.println("Subject " + (i+1) + " : ");

     marks[i]=Integer.parseInt(br.readLine());

    }

   }

   int gettotalmarks()

   {

    int total=0;

    for(int i=0;i<6;i++)

    {

     total=total+marks[i];

    }

    return total;

   }

}

class teststats{

   public static void main(String args[]) throws IOException

   {

    int total[],no;

     student stud[];

     BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

     System.out.println("Enter Number of Students:");

     no=Integer.parseInt(br.readLine());

     stud=new student[no];

     total=new int[no];

     for(int i=0;i<no;i++)

     {

      stud[i]=new student();

      stud[i].getdata();

     }

     for(int i=0;i<no;i++)

     {

      total[i]=stud[i].gettotalmarks();

     }       

    total=new int[args.length];      

    for(int i=0;i<total.length;i++)

    {

     total[i]=Integer.parseInt(args[i]);

    }   

    Statistical_data stats=new Statistical_data();

    stats.setdata(total);

    System.out.println("MEAN:"+stats.mean());

    System.out.println("MEDIAN:"+stats.median());

    System.out.println("MODE:"+stats.mode());      System.out.println("PERCENTILE:"+stats.percentile(25));

    System.out.println("VARIANCE:"+stats.variance());

    System.out.println("STANDARD DEVIATION:"+stats.standard_deviation());

    System.out.println("Q3:"+stats.quartile(3));

    System.out.println("Q2:"+stats.quartile(2));

    System.out.println("Q1:"+stats.quartile(1));

    System.out.println("INTERQUARTILE DEVIATION:"+stats.IQR());

   }

}