问题如下:
For a binomial random variable with five trials, and a probability of success on each trial of 0.50, the distribution will be:
选项:
A.skewed.
B.uniform.
C.symmetric.
解释:
C is correct.
The binomial distribution is symmetric when the probability of success on a trial is 0.50, but it is asymmetric or skewed otherwise. Here it is given that p = 0.50
我看到助教之前的解答里,“当p=0.1时二项分布是右偏的,当p=0.9时二项分布是左偏的。”
请问这是为什么呀