This page calculates various digital features of two-dimensional discrete random variables online, including mathematical expectation, variance, covariance, and correlation coefficient.

In the above table, fill in the possible values of the random variable X in the first line, fill in the possible values of the random variable Y in the first column, and the possible values of X and Y cannot exceed three.

Then fill in the middle of the table, X, Y take the probability of each pair, and then click the "Start Calculation" button, the program will check the validity of the input data.

If valid, each digital feature is calculated. Please note that the input data can be a decimal number such as 0.25, or a score, such as "2/3" means two-thirds.

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