如何计算直方图的平均值和标准差

简介：come over! The bloody cheongsam's bright and glistening jade hands grasped the thin and indifferent evil ghost. Suddenly, the figure trembled and twisted. With an unwilling roar, the thin and indifferent evil ghost directly turned into a ball of black energy and moved towards the bloody cheongsam. The energy surged into Yanli's hand and turned into a black energy ball the size of a baby's fist in her palm.