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【简答题】
一家食品公司考虑向市场投放一种新食品，以增加供应品种。销售研究部门认为，若销量好(概率为0.7)每月可获利50万元；若销量不好(概率为0.3)每月将亏损28万元。现有两个可能策略： (1)根据现有信息，立即决定是否销售新食品； (2)自己进行可靠性为70%的市场调查，调查费用为2万元。 试计算：
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【单选题】随机变量X服从标准正态分布N(0,1).若【图片】取值为0.1，0.3，0.5，0.7，0.9，则对应的【图片】值分别是：
A.
1.2816，0.5244，0，-0.5244，-1.2816
B.
-1.2816，-0.5244，0，0.5244，1.2816
C.
1.2816，-0.5244，0，0.5244，-1.2816
D.
-1.2816，0.5244，0，-0.5244，-1.2816
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【多选题】若由n个随机变量构造的统计量服从χ^2分布,则需满足下列哪些要求() A 随机变量X_1,X_2,......,X_n相互独立 B X_i(i=1,2......,n)服从标准正态分布N(0,1) C 随机变量的和 服从χ^2分布 D 随机变量的平方和 服从分布 E 自由度是n+1 F 自由度是n
A.
随机变量X_1，X_2，……，X_n相互独立
B.
X_i（i=1,2……,n）服从标准正态分布N(0,1)
C.
随机变量的和 服从χ^2分布
D.
随机变量的平方和 服从分布
E.
自由度是n+1
F.
自由度是n
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【单选题】The words 'make' and 'bus' are called ______ because they can occur unattached.
A.
derivational morphemes
B.
inflectional morphemes
C.
bound morphemes
D.
free morpheme
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【简答题】阅读理解。 My name is Gina Miller. I'm an English girl. I'm 11. I'm in No 7 Middle School. And I'm in Class 3, Grade7. I have two good friends, Li Ying and Mike. Li Ying is a Chinese girl. Her hair is blac...
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【简答题】Suggestopaedia believes that language learning can occur at a much faster rate than it is often expected if learners can make better use of their______ powers.
查看完整题目与答案
【单选题】随机变量X服从标准正态分布N(0,1).若【图片】取值为0.1，0.3，0.5，0.7，0.9，则对应的【图片】值分别是：
A.
-1.2816，-0.5244，0，0.5244，1.2816
B.
1.2816，0.5244，0，0.5244，1.2816
C.
1.2816，0.5244，0，-0.5244，-1.2816
D.
-7.2816，-0.5244，0，0.5244，7.2816
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【单选题】设随机变量X服从标准正态分布N(0,1),则E(X )=
A.
2e -2
B.
2e²
C.
-2e²
D.
e²
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【简答题】Suggestopaedia believes that language learning can occur at a much faster rate than it is often expected if learners can make better use of their______ powers.
查看完整题目与答案
【单选题】In zones where earthquakes are known to occur, ______ construction techniques can significantly reduce the effects of seismic wave.
A.
to improve
B.
improving
C.
improved
D.
being improving
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【单选题】Who can predict the misery that may ______ humankind?
A.
happen
B.
befall
C.
chance
D.
occur
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相关题目：
【单选题】随机变量X服从标准正态分布N(0,1).若【图片】取值为0.1，0.3，0.5，0.7，0.9，则对应的【图片】值分别是：
A.
1.2816，0.5244，0，-0.5244，-1.2816
B.
-1.2816，-0.5244，0，0.5244，1.2816
C.
1.2816，-0.5244，0，0.5244，-1.2816
D.
-1.2816，0.5244，0，-0.5244，-1.2816
查看完整题目与答案
【多选题】若由n个随机变量构造的统计量服从χ^2分布,则需满足下列哪些要求() A 随机变量X_1,X_2,......,X_n相互独立 B X_i(i=1,2......,n)服从标准正态分布N(0,1) C 随机变量的和 服从χ^2分布 D 随机变量的平方和 服从分布 E 自由度是n+1 F 自由度是n
A.
随机变量X_1，X_2，……，X_n相互独立
B.
X_i（i=1,2……,n）服从标准正态分布N(0,1)
C.
随机变量的和 服从χ^2分布
D.
随机变量的平方和 服从分布
E.
自由度是n+1
F.
自由度是n
查看完整题目与答案
【单选题】The words 'make' and 'bus' are called ______ because they can occur unattached.
A.
derivational morphemes
B.
inflectional morphemes
C.
bound morphemes
D.
free morpheme
查看完整题目与答案
【简答题】阅读理解。 My name is Gina Miller. I'm an English girl. I'm 11. I'm in No 7 Middle School. And I'm in Class 3, Grade7. I have two good friends, Li Ying and Mike. Li Ying is a Chinese girl. Her hair is blac...
查看完整题目与答案
【简答题】Suggestopaedia believes that language learning can occur at a much faster rate than it is often expected if learners can make better use of their______ powers.
查看完整题目与答案
【单选题】随机变量X服从标准正态分布N(0,1).若【图片】取值为0.1，0.3，0.5，0.7，0.9，则对应的【图片】值分别是：
A.
-1.2816，-0.5244，0，0.5244，1.2816
B.
1.2816，0.5244，0，0.5244，1.2816
C.
1.2816，0.5244，0，-0.5244，-1.2816
D.
-7.2816，-0.5244，0，0.5244，7.2816
查看完整题目与答案
【单选题】设随机变量X服从标准正态分布N(0,1),则E(X )=
A.
2e -2
B.
2e²
C.
-2e²
D.
e²
查看完整题目与答案
【简答题】Suggestopaedia believes that language learning can occur at a much faster rate than it is often expected if learners can make better use of their______ powers.
查看完整题目与答案
【单选题】In zones where earthquakes are known to occur, ______ construction techniques can significantly reduce the effects of seismic wave.
A.
to improve
B.
improving
C.
improved
D.
being improving
查看完整题目与答案
【单选题】Who can predict the misery that may ______ humankind?
A.
happen
B.
befall
C.
chance
D.
occur
查看完整题目与答案