NO.PZ2018062016000080
问题如下:
Given a certain binomial random variable x, the number of total trials is 10. If the probability of x successes in 10 trials is all 0.5, the binomial distribution is most likely to be:
选项:
A.asymmetric
B.skewed.
C.symmetric.
解释:
C is correct. The only way for a binomial distribution to be symmetric is that the probability of x successes in all trials equals 0.50.
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