下表提供了某厂节能降耗技术改造后生产甲产品过程记录的产量 x （吨）与相应的生产能耗 y （吨标准煤）的几组对照数据：x3456y2.5344.5参考公式： {b^=∑i=1nxiyi−nx¯y¯∑i_刷题宝

题干

下表提供了某厂节能降耗技术改造后生产甲产品过程记录的产量 x （吨）与相应的生产能耗 y （吨标准煤）的几组对照数据：

x	3	4	5	6
y	2.5	3	4	4.5

参考公式： {b^=

∑

i

=

1

n

x

i

y

i

−

n

x

¯

y

¯

∑

i

=

1

n

x

i

2

−

n

x

¯

2

=

∑

i

=

1

n

(

x

i

−

x

¯

)

(

y

i

−

y

¯

)

∑

i

=

1

n

(

x

i

−

x

¯

)

2

a^=y¯−b^x¯

上一题下一题 0.0难度选择题更新时间:2015-10-23 06:37:16

答案(点此获取答案解析）

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Last term,Peter was ____ at home.His parents were doing busines in another city. He felt lonely,so he often turned on the computer and played computer ____. However, sitting in front of the computer for a long time is ____ for him. And he spent little time on his study.He failed his exams.Luckily,his parents ____ his problem in time.They decided to come back home.Peter studies hard now.So far,he has made progress in his study.He ____ he can catch up with his classmates soon.

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