모집단의 평균과 분산과 표준편차(Mean and Variance and Standard Deviation of Population) : https://goo.gl/y8Jf17 YouTube : https://youtu.be/QxhlvO52saU[br][br]기하작도문제 : https://ggbm.at/jFazZw2g 수학자료실 강의실 : https://goo.gl/czyJLW YouTube Channel : https://goo.gl/JpzU5i twitter : https://twitter.com/mineungi