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【单选题】
一个离散型的随机变量X,X=0的概率为0.75,X=1的概率为0.12,X=2的概率为0.08,X=3的概率为0.05;那么X的方差为:A.
0.43
B.
0.8397
C.
1
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皮皮学刷刷变学霸
举一反三
【单选题】Which of the following statements is NOT tree of 'free flight'?
A.
Commercial aircraft is guided by GPS.
B.
Civilian aircraft are free to move over all territories.
C.
Cargo carriers no longer collide with one another.
D.
Passenger flights are safe to fly with military aircrafts.
【简答题】传统的饮食器具以__________________为主。
【单选题】Which of the following statements is NOT true of 'free flight'?
A.
Commercial aircraft is guided by GPS.
B.
Civilian aircraft are free to move over all territories.
C.
Cargo carders no longer collide with one another.
D.
Passenger flights are safe to fly with military aircrafts.
【单选题】According to the methods we learned in Week 6, which one of the following is a phrase?
A.
Fěnbǐ‘chalk’.
B.
Jiǔguǐ ‘an alcoholic’.
C.
Lǐxiǎng ‘ideal’.
D.
Jǔshǒu ‘raises to hand’.
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