单选题:某种商品1~6周期的实际销售量分别为:580千克、580千克、600千克、610千克、630千克、630千克。采用算术平

题目内容:
某种商品1~6周期的实际销售量分别为:580千克、580千克、600千克、610千克、630千克、630千克。采用算术平均数法计算,则第7周期销售量的预测值为(  )千克。 A.580
B.605
C.610
D.630

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