Question

Create a C++ program that calculates an unbiased standard deviation of 5 input numbers.

Please Submit:

1. A flowchart of your program. (3 points)

2. Your C++ program with a heading comment, also appropriate spacing and indentation in the program body.

3. Copy of a screenshot after your program is executed. (Section 2 and3: 7 points)

/* ELEN 1301 Programming Assignment #8.

Name : Your name.

Student ID : Your student ID #.

Due date :

Purpose of the program : Creating a program that usus an array and calculate an unbiased standard deviation.

Section 1 : Receive a number and store it in an array. We assume there will be always 5 input numbers.

Section 2 : Repeat Section 1 five times.

Section 3 : Find the mean of the five numbers.

Section 4 : Subtract mean from each input that is stored in the array. Square it.

Section 5 : Repeat Section 4 for all the stored input, so that the summention is done.

Section 6 : Divide the sum by (N – 1), in this case it would be 4, and take a square root of the value to show the Standard Deviation.

Answer 1

Here is your C++ program to find out unbiased standard deviation of 5 input numbers.

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stdDeviation..cpp

#include <iostream>
#include <cmath>
using namespace std;

float CalstdDeviation(float StoreArr[]);

int main()
{
    int i;
    float StoreArr[5]; // Array to store
    // User input ,limited to 5 only
    cout << "Enter five(5) elements: ";
    for(i = 0; i < 5; ++i)
        cin >> StoreArr[i];

    cout << endl <<"Standard Deviation = " << CalstdDeviation(StoreArr)<<endl;

    return 0;
}
// Function to find out standard deviation
float CalstdDeviation(float StoreArr[])
{
    // variables
    float sum = 0.0, mean, standardDeviation = 0.0;

    int i;

    for(i = 0; i < 5; ++i)
    {
        sum += StoreArr[i];
    }

    mean = sum/5;

    for(i = 0; i < 5; ++i)
        standardDeviation += pow(StoreArr[i] - mean, 2);

    return sqrt(standardDeviation / 5);
}

Output: - Refer to screenshot

Flowchart :- Refer to below image

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Thank you!!