- Variable: an unknown number.
- Expressions contain variables, operations (+, -, x, ÷), and numbers, in any combination. (there is no equals sign = in an expression)
- Mean: add up all the values and divide by how many values there are.
- Median: the middle number in a set of ordered values, might be the mean of two middle values.
- Mode: the value that shows up the most.
- Range: positive difference between largest and smallest values.
- Outlier: values too big or small compared to other values.
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