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统计数据对象 类 Statistics 中的求均值函数（statistics.mean()）返回值为 int 型，请
问有没有类似的函数返回值为 浮点型的？(本人现在想精确计算一段区域的灰度均
值，希望数值精确到小数点)
目前只能返回int的平均数。
你可以考虑自己改一下代码。