下列是關於統計--標準常態分配的相關問題，懇請會解題網友如果可以的話，希望詳答解惑，謝謝!!!! (1) P(-A<=Z<=A)=0.93求A (2) P(-A<=Z<=A=0.2052求A P.S <= 是小於等於?
回答 (3)
2017-08-04 4:29 pm
✔ 最佳答案
(1)(1-0.93)/2=0.035 (Z<-A or A<Z 都為0.035)
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得Z= - 2.7
Ans: A=2.7
(2)
(1-0.2052)/2=0.3974
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得Z= - 0.26
Ans: A=0.26
2017-08-05 5:36 pm
1)
P(-A<=Z<=A)=0.93
2P(0<=Z<=A)=0.93
P(0<=Z<=A)=0.465
(1.82-A)/(0.4656-0.465)=(A-1.81)/(0.465-0.4649)
(1.82-A)/6=(A-1.81)
1.82-A=6A-10.86
12.68=7A
A=1.811
2)
P(-A<=Z<=A)=0.2052
2P(0<=Z<=A)=0.2052
P(0<=Z<=A)=0.1026
A=0.26
P(-A<=Z<=A)=0.93
2P(0<=Z<=A)=0.93
P(0<=Z<=A)=0.465
(1.82-A)/(0.4656-0.465)=(A-1.81)/(0.465-0.4649)
(1.82-A)/6=(A-1.81)
1.82-A=6A-10.86
12.68=7A
A=1.811
2)
P(-A<=Z<=A)=0.2052
2P(0<=Z<=A)=0.2052
P(0<=Z<=A)=0.1026
A=0.26
2017-08-07 3:47 pm
謝謝你了！！????
收錄日期: 2021-04-18 17:31:31
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20170804065440AAc2W1s