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  1. #include <stdio.h>
  2.  
  3. int main()
  4. {
  5. 	// 母集団
  6. 	int x[] = {44, 100, 63, 99, 25, 47, 96, 42, 70, 100, 25, 80, 98, 49, 9, 46, 92, 65, 57, 50, 55, 95, 33, 7, 5, 56, 3, 25, 85, 96};
  7. 	int m = sizeof x / sizeof (int);
  8. 	int i;
  9. 	double u;
  10. 	double s2;
  11. 	double sum;
  12.  
  13. 	// 相加平均
  14. 	sum = 0;
  15. 	for (i = 0; i < m; i++) {
  16. 		sum += x[i];
  17. 	}
  18. 	u = sum / m;
  19.  
  20. 	// 母分散
  21. 	sum = 0;
  22. 	for (i = 0; i < m; i++) {
  23. 		sum += (u - x[i]) * (u - x[i]);
  24. 	}
  25. 	s2 = sum / m;
  26.  
  27. 	// 出力
  28. 	printf("平均値=%f\n", u);
  29. 	printf("分散=%f\n", s2);
  30.  
  31. 	return 0;
  32. }
  33.  
Success #stdin #stdout 0s 2052KB
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平均値=57.233333
分散=974.645556
https://ideone.com/DLYYK6
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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