Question

need done in java

An experiment was conducted and resulted in a series of pH measurements. The number of samples is known ahead of time. Have your program prompt the user to enter that number of measurements. Validate the number to ensure it's in the range of 2 to 100 measurements, inclusive. If it is out range, display an error message, Error: valid range is 2 to 100

If it's within the range, then use the number of measurements to drive a counter-controlled while loop. During each iteration of the loop, prompt the user to enter a pH sample, one value at a time. When all data has been input, calculate and display the average (mean) pH value. Before calculating the mean, be sure to check for division by 0.

The input dialog and output must conform to these examples:

Good range:

Enter the number of samples: 4

Sample 1: 4.3
Sample 2: 10.1

Sample 3: 7.2

Sample 4: 8.7

Mean pH: 7.58

Bad range:

Enter the number of samples: 1

Error: valid range is 2 to 100

Answer 1

First, she makes the decision variables and the model of the problem. In the case, there are 19 decision variables : Xi = buy new sheets where i is the week

Yi = Wash at the Local Laundry where i is the week
Zi = Washing by Marry�s friends where i is the week
The cost of buying new sheet is $10, wash at the Local Laundry is $4 and by Marry�s friends is $2, and then we can make the model

Minimize C (cost) = 10 ( X1+X2+X3+X4+X5+X6+X7+X8) +4 (Y1+Y2+Y3+Y4+Y5+Y6) + 2 (Z1+Z2+Z3+Z4+Z5)
Subject to :
Week 1 : X1 = 115
Y1 + Z1 = 115
Week 2 : X2 = 210
Y2 + Z2 = 210
Week 3 : X3 + 0.8 Y1 = 250
Y3 + Z3 = 250
Week 4 : X4 + 0.8 Y2 + 0.8 Z1 = 230
Y4 + Z4 = 230
Week 5 : X5 + 0.8 Y3 + 0.8 Z2 = 260
Y5 +Z5 = 260
Week 6 : X6 + 0.8 Y4 + 0.8 Z3 = 300
Y6 = 300
Week 7 : X7 + 0.8 Y5 + 0.8 Z4 = 250
Week 8 : X8 + 0.8 Y6 + 0.8 Z5 = 190
X1, X2,�, Z5 >=0 and integer

For the laundry, it needs a week to finish the washing but Marry deliver the dirty in the weekend so that the clean sheets from week 1 can be used in the week 3. And washing in Marry�s friend, they need 2 weeks to deliver the clean sheets back and the clean sheets can be used in the week 4. 20 % from the washing ( laundry and Marrys friends ) are removed. In week 6, we don�t need to wash at Marry�s friends and in the Week 7 & 8 we don�t need to wash again because it exceeds the sport camp.

Answer 2

Program Screenshot:

// import statements import java.util.Scanner; / Create a class BandRange public class BadRange Main method public static void main(String[] args) // Create an object for the Scanner class Scanner read new Scanner (System.in); System.out.print ("Enter the number of samples: "); // Accept the number of samples from the user int noSamplesInteger.parseInt(read.nextLine )); // Check the number of samples input if (noSamples < 21 noSamples > 100) // Print the error message System.out.println ("Error valid range is 2 to 100"); // Exit from the program System.exit (1) System.out.println) d uble total = 0; int i 0 // Create while loop to accept the samples from the user while (i < noSamples) System.out.print("Sample "+ (i + 1) + ": "); total total + Double.parseDouble (read.nextLine)); System.out.println) // Calculate the average double average total / noSamples; System.out.printf ("Mean pH .2f, a average)

Sample output screenshot1:

Sample output screenshot2:

Code to copy:

// import statements

import java.util.Scanner;

// Create a class BandRange

public class BadRange

{

    // Main method

    public static void main(String[] args)

    {

        // Create an object for the Scanner class

        Scanner read = new Scanner(System.in);

        System.out.print("Enter the number of samples: ");

        // Accept the number of samples from the user

        int noSamples = Integer.parseInt(read.nextLine());

        // Check the number of samples input

        if (noSamples < 2 || noSamples > 100)

        {

            // Print the error message

            System.out.println("Error: valid range is 2 to 100");

            // Exit from the program

            System.exit(1);

        }

        System.out.println();

        double total = 0;

        int i = 0;

        // Create while loop to accept the samples from the user

        while (i < noSamples)

        {

            System.out.print("Sample " + (i + 1) + ": ");

            total = total + Double.parseDouble(read.nextLine());

            i++;

        }

        System.out.println();

        // Calculate the average

        double average = total / noSamples;

        System.out.printf("Mean pH: %.2f", average);

    }

}