Question

Write a function that determines standart deviation of float array. The function takes dataset as a float array parameter!! And it also return result as a float. (Clue: calculate average first) Definations: σ=√1N Σi =1 N ( xi− x ) σ = standard deviation xi = each value of dataset x (with a bar over it) = the arithmetic mean of the data (This symbol will be indicated as average of dataset) N = the total number of data points (if you need square root of some number you can use sqrt function in math.h library. Usage example: a=sqrt(b); which means “a” is equal to square root of “b”)

Answer 1

1. #include <math.h>
2. #include <stdio.h>
3. float calculateSD(float data[]) {
4. float sum = 0.0, mean, SD = 0.0;
5. int i;
6. for (i = 0; i < 10; ++i) { // loop to calculate sum
7. sum += data[i];
8. }
9. mean = sum / 10; // mean calculation
10. for (i = 0; i < 10; ++i)
11. SD += pow(data[i] - mean, 2); // (xi - mean(x))2
12. return sqrt(SD / 10);
13. }