- Placeholders for the possible values of some process.
- Commonly use X, Y, Z to notate random variables.
- Usually represented by capital letters. (X, Y, Z)
Observed Values:
- observed values for each variable(X, Y, Z)
- usually represented by lowercase letters(x, y, z)
Summation:
i=1∑n xi
Notation for the Mean:
- 1/n means the whole summation is divided by the no. of variables
n1 i=1∑n xi
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