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【单选题】
变 量 Y ~ N ( 100 , 80 ) ,当以 n 1 = n 2 =10 进行抽样时, | m 1 - m 2 | >8 的概率约为 ( )A.
0.10
B.
0.62
C.
0.025
D.
0.01
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皮皮学刷刷变学霸
举一反三
【单选题】What time can a car stop here?
A.
At 9 a.m. on Tuesday.
B.
At 3 p.m. on Thursday.
C.
At 9 p.m. on Saturday
【简答题】A．They can take good care of their parents. B．They can have more time to work. C．They can not afford a new house. D．They can eat the already-done dinner after work.
【单选题】What was uncommon in the old ladies' time?
A.
Attending college
B.
Struggling to find a job
C.
paper chains
D.
Serving food to retired nuns
【单选题】What can we infer from the story?
A.
． Marty ’ s life is full of challenges.
B.
． Marty isn ’ t confident enough.
C.
． Marty loses heart because of his disability.
D.
． Marty hopes that everyone can help him.
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