单项选择题
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
点击查看答案&解析
相关考题
-
单项选择题
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 -
单项选择题
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 -
单项选择题
From a population of 500 elements，a sample of 225 elements is selected.It is known that the variance of the population is 900.The standard error of the mean is approximately（）
A.1.1022
B.2
C.30
D.1.4847
