# Basic Statistics & Probability

### Example 1

Find the mean, median, mode and range of this data set:

19, 18, 21, 16, 15, 17, 20, 18

### Example 2

Which of the three averages does not describe the "middle" of this data set?

100, 99, 97, 97, 96, 98, 95, 72

### Example 3

On his first three quizzes, Patrick earned a 15, 18, and 16. (A perfect score would have been 20 points.) What does he need to earn on the next quiz to have a mean score of at least 17?