Make a prediction first. Then see how close you were.

A team of 10: nine people complete 20 tasks a week, one completes 110. What is the mean number of tasks?

Range 0 to 120. Answer: 29 tasks

(9 × 20 + 110) ÷ 10 = 29. One very busy person lifts the mean well above what anyone else does. The median is 20.

A survey says 80% are satisfied, but only 15 of the 300 people asked replied. Roughly what share of everyone asked said they were satisfied?

Range 0 to 100. Answer: 4%

80% of 15 is 12 people, which is 4% of the 300 asked. We know nothing about the other 285, and the people who reply are often not typical.