直方图的平均值和标准差怎么算简介：Old Man Li also laughed when he heard what the villagers said, and then asked his son in a low voice: Didn't the palace have a pig farm, and it's time to start killing pigs today. Why don't you go over and help?
Old Man Li also laughed when he heard what the villagers said, and then asked his son in a low voice: Didn't the palace have a pig farm, and it's time to start killing pigs today. Why don't you go over and help?
