Subtopic: Mean, median, mode and standard deviation
Question Statement:
The median of the dataset $\{3, 7, 8, 5, 12, 14, 21, 13, 18\}$ is:
Answer Key:
8
Step-by-Step Solution & Explanation
Sorted dataset: $\{3, 5, 7, 8, 12, 13, 14, 18, 21\}$. There are $n = 9$ observations. The median is the 5th term, which is $12$. (Wait: 5th term is 12). Let's double check: 3, 5, 7, 8 (4 items) -> 12 (5th item) -> 13, 14, 18, 21 (4 items). The median is 12.