Activity focus
- mean calculation
- sum and count checks
- outlier effect
Practice set
- Find the mean of
2, 4, 6, 8, 10. - Find the mean of
12, 14, 14, 20. - Which dataset is more affected by an outlier?
4, 5, 6, 7, 84, 5, 6, 7, 80
Answer key
30/5 = 660/4 = 154, 5, 6, 7, 80
MCQ traps
- dividing by the largest value instead of the number of values
- forgetting to include repeated values in the sum