NO.PZ2020010302000009
问题如下:
Consider the following data on a discrete random variable X:
a. Calculate the mean and variance of X.
b. Standardize X and check that the mean and variance of X are 0 and 1 respectively.
c. Calculate the skew and kurtosis of X.
选项:
解释:
a. The mean is -0.803 and the variance is 6.762.
b.
不知道怎么计算每一个表格中的 x standardized