https://blog.gongquiz.com/2023/03/18/1m-%ed%99%a9%ec%82%b0-100ml%ec%9d%98-%eb%85%b8%eb%a5%b4%eb%a7%90-%eb%86%8d%eb%8f%84normality-n%eb%8a%94-%ec%96%bc%eb%a7%88%ec%9d%b8%ea%b0%80-%eb%8b%a8-%ec%88%98%ec%86%8c-9%ea%b8%89/