某公司的广告费支出x与销售额y（单位：万元）之间有下列对应数据

某公司的广告费支出x与销售额y（单位：万元）之间有下列对应数据：

x	2	4	5	6	8
y		40	60	50	70

已知y对x呈线性相关关系，且回归方程为，工作人员不慎将表格中y的第一个数据遗失，该数据为．

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某公司的广告费支出x与销售额y（单位：万元）之间有下列对应数据

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