Practice Problems (pdf)

### Mean (the average)

### Median

Middle value when items are arranged from least to greatest

### Range

The difference between the max value and min value

### Mode

Value that occurs the most in a set

### Standard Deviation

Shows how spread data points are.

**Low standard deviation: ** data points are closer to the mean

**High standard deviation: ** data is spread over a wider range

### Probability of an Event

**Joint or conditional probability **

**Mutually exclusive probability**

### Fundamental Counting Principle

Pick 1 from each group, multiply the number of options in each group

### Permutation

A combination of events occurring when order matters and the items cannot be repeated

### Combination

A combination of events occurring when the order does NOT matter