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單項(xiàng)選擇題

The student body of a large university consists of 60%female students.A random sample of 8 students is selected.What is the probability that among the students in the sample exactly two are female？（）

A.0.0896
B.0.2936
C.0.0413
D.0.0007

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單項(xiàng)選擇題

A weighted average of the value of a random variable, where the probability function provides weights is known as（）

A.a probability function
B.a random variable
C.thee xpected value
D.random function

單項(xiàng)選擇題

A sample of 400 observations will be taken from an infinite population. The population proportion equals 0.8. The probability that the sample proportion will be greater than 0.83 is（）

A.0.4332
B.0.9332
C.0.0668
D.0.5668

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