求三个月的简单滑动平均预测值

月份 / 实际销售额

1/10 2/12 3/13 4/16 5/19 6/23

因为要计算3个月的预测值 所以从已知数据来看  只能从4月开始计算

4月 = (10+12+13) / 3 ~ 11.67

(前三个月实际销售额总和)/ 3个月

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