Here is a C++ program to calculate standard deviation. In this C++ program, we will calculate standard deviation of N numbers stored in an array. Standard Deviation in statistics is a measure that is used to quantify the amount of variation in a set of data. Its symbol is σ (greek letter sigma) is used to represent standard deviation.

## C++ Program to Calculate Standard Deviation

#include <iostream> #include <cmath> using namespace std; float findStandardDeviation(float *array, int count); int main() { int count, i; float inputArray[500]; cout << "Enter number of elements\n"; cin >> count; cout << "Enter " << count <<" elements\n"; for(i = 0; i < count; i++){ cin >> inputArray[i]; } cout << "Standard Deviation = " << findStandardDeviation(inputArray, count); return 0; } // Function to find standard deviation float findStandardDeviation(float *array, int count) { float sum = 0.0, sDeviation = 0.0, mean; int i; for(i = 0; i < count; i++) { sum += array[i]; } // Calculating mean mean = sum/count; for(i = 0; i < count; ++i) { sDeviation += pow(array[i] - mean, 2); } return sqrt(sDeviation/count); }Output

Enter number of elements 10 Enter 10 elements 2 4 5 6 8 9 10 13 14 16 Standard Deviation = 4.36005

In above program, we first take N numbers as input from user and store it in an integer array "inputArray". Here we have created a function "findStandardDeviation" calculates and return the value of standard.

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