includes a function to calculate the mode (most frequently occurring score) includes a function to calculate the standard deviation includes a function to determine the number of students having scores in each of the following ranges: 0-24, 25-49, 50-74, 75-99, 100-124, 125-149, 150-174, 175-200 and output each score range followed by the number of students within that range
I was asked to repost the question to get the other parts solved:
Write a program using c++ that:
- includes a function that reads integers consisting of students’ test scores in the range of 0-200 from a file into a one-dimensional array of size 30
- includes a function to calculate the mean (add all the scores and divide by the number of scores)
- includes a function to calculate the median (sort the scores and then find the score in the middle—if there is an odd number of scores, the median is the middle score; otherwise, it is the average of the two middle scores)
- includes a function to calculate the mode (most frequently occurring score)
- includes a function to calculate the standard deviation
- includes a function to determine the number of students having scores in each of the following ranges: 0-24, 25-49, 50-74, 75-99, 100-124, 125-149, 150-174, 175-200 and output each score range followed by the number of students within that range
- includes a function to print everything to an output file
Clearly identify all output. Do not use global variables. Your main function should consist primarily of function calls.
Use the following data:
76, 89, 150, 135, 200, 76, 12, 100, 150, 28, 178, 189, 167, 200, 175, 150, 87, 99, 129, 149, 176, 200, 87, 35, 157, 189
Here is the code so far:
//main.cpp
#include<iostream> //header files for cin/cout functions
#include<fstream> //header file for ifstream
#include <algorithm> //header file for sort
using namespace std;
//function that reads integers from a file
//into a one-dimensional array of size 30
void readArray(int arr[30],int n){
cout<<"The size of array is : "<<n<<endl;
cout<<"Element of Array is :"<<endl;
for(int i=0;i<n;i++)
{
cout << arr[i] << " ";
}
}
//function to calculate and print the mean
void calculateMean(int arr[30],int n){
int sum=0;
for(int i=0;i<n;i++)
{
sum=sum+arr[i];
}
cout<<"\n\nMean is:"<<(sum/n)<<endl;
}
//function to calculate and print the median
void calculateMedian(int arr[30], int n)
{
float median;
// First we sort the array
sort(arr, arr + n);
cout<<"\nSorted Array is"<<endl;
for(int i=0;i<n;i++)
{
cout << arr[i] << " ";
}
// check for even case
if (n % 2 != 0)
median=arr[n / 2];
median=(arr[(n - 1) / 2] + arr[n / 2]) / 2.0;
cout<<"\n\nMedian is :"<<median<<endl;
}
//start of main function
int main()
{
int n = 0,x;
int arr[30];
ifstream File;
File.open("file.dat");
if(!File.is_open()) //if the file is not open output
{
cout<<"It failed"<<endl;
return 0;
}
while(File>>x) //if the file is open
{
arr[n] = x;
n++;
}
File.close();
//calling function
readArray(arr,n);
calculateMean(arr,n);
calculateMedian(arr,n);
return 0;
} //end of main function
Note: Since you have again posted multiple independent questions in the same request, we will solve the 4,5 and 6 subparts for you. To get the remaining questions solved, please repost other questions independently.
Introduction of Program
In this C++ Program, File handling is used and the program will calculate the standard deviation, mode, and ranges of the array. As we know mode is the value that occurs most frequently in a set of observations. You can add other values in the file to check the mode of the array.
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