PRACTICAL STATISTICS
Averages and totals
Practice worksheet / 2026-04-25

Student: Sofia Marino

- Show calculations and include units where needed.
- Write short explanations in complete sentences.
- Use the separate answer key after completing the questions.

1. A group records reading times of 15, 20, 25, 30 and 85 minutes. Calculate the mean and median.





2. A workshop buys 12 notebooks at EUR 3.40 each and 8 pens at EUR 1.25 each. Calculate the total cost before tax.





3. A survey receives 48 replies from 160 invitations. Calculate the response rate as a percentage.





4. Explain why the mean reading time in question 1 is larger than the median.

Sofia Marino                                                                                                                      WS-2604-0251
Answer key
Averages and totals

Question 1
Mean: 35 minutes. Median: 25 minutes.

Question 2
EUR 50.80.

Question 3
30%.

Question 4
The value of 85 minutes raises the mean. It does not change the middle position in the ordered values.