Hi, First off, I really appreciate your help!!! Question: Specify, design, and i

Question

Hi,

First off, I really appreciate your help!!!

Question: Specify, design, and implement aclass called statistician. After a statistician isinitialized, it can be given a sequence of double numbers. Each number in sequence is given to the statistician by activating a method called nextNumber. For example, we can declare a statistician called s, and then give it the sequenceof numbers 1.1, -2.4, 0.8 as shown here:

statistician s;

s.nextNumber (1.1);

s.nextNumber(-2.4);

s.nextNumber (0.8);

After a sequence has been given a statistician, there are various methods to obtain information about the sequence. Include methods that will provide the length of the sequence, the last number of thesequence, the sum of all numbers in a sequence, the arithmetic mean of the numbers (i.e., the sum of the numbers divided by the length of the sequence), the smallest number in the sequence, and the largest number in the sequence. Notice that the length andthe sum functions can be called at anytime, even if there are no numbers in the sequence. In this case of an "empty" sequence, both length and sum will be zero. The other methods should return Double.NaN if they are called for an empty sequence.

Notes: Do not try to store the entire sequence (because you don't know ow long this sequence will be). Instead, just store the neccessary information about the sequence: What is the sequence length, what is the sum of numbers in the sequence, and what are the last, smallest, and largest numbers? Each of these pieces of information can be stored in a private instance variable that is updated whenever nextNumber is activated.

THANK YOU VERY MUCH FOR YOUR HELP!

Explanation / Answer

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public class StatisticianDriver
{public static void main(String[] args)
{Statistician s=new Statistician();
System.out.println("Before anything entered");
System.out.println("mean= "+s.getMean());
System.out.println("Largest number= "+s.getBiggest());
System.out.println("Smallest number= "+s.getSmallest());
System.out.println("Last number entered= "+s.getLast());
System.out.println("Number of numbers entered= "+s.getLength());
s.nextNumber (1.1);
s.nextNumber(-2.4);
s.nextNumber (0.8);
System.out.println(" After numbers entered");
System.out.println("sum= "+s.getSum());
System.out.println("mean= "+s.getMean());
System.out.println("Largest number= "+s.getBiggest());
System.out.println("Smallest number= "+s.getSmallest());
System.out.println("Last number entered= "+s.getLast());
System.out.println("Number of numbers entered= "+s.getLength());
}
}

----------------------------------------------

public class Statistician
    {private double sum;
    private double small;
    private double big;
    private double last;
    private int count;
    public Statistician()
        {sum=0;
        count=0;       
        }

    public double getLength()
    {return count;
    }

    public double getLast()
    {return last;
    }
    public double getSum()
    {return sum;
    }
    public double getMean()
    {return sum/count;
    }
    public double getSmallest()
    {return small;
    }
    public double getBiggest()
    {return big;
    }
    public void nextNumber(double n)
    {count++;
    if(count==1)
        {big=n;
        small=n;
        }
    else
        {if(n>big)
            big=n;
         if(n<small)
            small=n;
        }
    sum+=n;
    last=n;
         }
    }

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