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單項選擇題

Exhibit 2 The following represents the probability distribution for the daily demand of computers at a local store.

Refer to Exhibit 2.The probability of having a demand for at least two computers is（）

A.0.7
B.0.3
C.0.4
D.1.0

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單項選擇題

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

單項選擇題

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

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