直方图的平均值和标准差怎么算

简介：At this time, Nanyun Juzi was sitting in the Taishi chair in Liu Xiaoneng's study, thinking hard about the strategy to defeat the enemy, with a face full of attention. Unexpectedly, a few seconds later, there was only a bang, and Lu Tao, Shouhou, and Zhao Tiezhu all had smiles on their faces. Mi kicked open the door and barged in.