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                # C 程序:計算標準差 > 原文: [https://www.programiz.com/c-programming/examples/standard-deviation](https://www.programiz.com/c-programming/examples/standard-deviation) #### 在此示例中,您將學習使用數組計算 10 個數字的標準差。 要理解此示例,您應該了解以下 [C 編程](/c-programming "C tutorial")主題: * [C 數組](/c-programming/c-arrays) * [將數組傳遞給 C 中的函數](/c-programming/c-arrays-functions) * * * 該程序使用數組計算單個系列的標準差。 訪問此頁面以了解[標準差](https://www.mathsisfun.com/data/standard-deviation.html)。 為了計算標準差,我們創建了一個名為`calculateSD()`的函數。 * * * ## 計算標準差的程序 ```c #include <math.h> #include <stdio.h> float calculateSD(float data[]); int main() { int i; float data[10]; printf("Enter 10 elements: "); for (i = 0; i < 10; ++i) scanf("%f", &data[i]); printf("\nStandard Deviation = %.6f", calculateSD(data)); return 0; } float calculateSD(float data[]) { float sum = 0.0, mean, SD = 0.0; int i; for (i = 0; i < 10; ++i) { sum += data[i]; } mean = sum / 10; for (i = 0; i < 10; ++i) SD += pow(data[i] - mean, 2); return sqrt(SD / 10); } ``` **輸出** ```c Enter 10 elements: 1 2 3 4 5 6 7 8 9 10 Standard Deviation = 2.872281 ``` 在這里,包含 10 個元素的數組將傳遞給`calculateSD()`函數。 該函數使用平均值計算標準差并將其返回。
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