4. Self-Test
Answers to all problems are available at the end of the textbook.
1. John had test scores of 84, 90, 95, 98 and 88. Find the average of his test scores.
2. Cheryl’s tips for the week were as follows: $86, $103, $118, $117, $126 and $149. Find the average of her tips.
3. The monthly rain fall for the last 5 months was: 31mm, 15mm, 28mm, 8mm, 41mm. Calculate the average rainfall over the 5 months.
4. The average regular season home attendance of the Toronto Blue Jays from 2015 to 2022 is listed in the chart below. Calculate the average attendance over this time. Round to the nearest person. (Note: 2020 there was no baseball, so it was not included).
| Year | Attendance |
| 2015 | 34,504 |
| 2016 | 41,880 |
| 2017 | 39,554 |
| 2018 | 29,066 |
| 2019 | 21,606 |
| 2021 | 10,119 |
| 2022 | 32,763 |
5. Find the weighted average. Round to the nearest hundredth.
| Customers each Hour | Frequency |
| 9 | 2 |
| 11 | 15 |
| 17 | 5 |
| 25 | 2 |
6. An independent research company conducted tests to determine the fuel consumption (L/100km) of a fleet of cars. Find the weighted average of L/100km for the fleet of cars. Round to the nearest tenth.
| L/100km | Number of Cars |
| 10.4 | 5 |
| 9.2 | 6 |
| 8.7 | 10 |
| 8.5 | 14 |
| 8.1 | 5 |
| 7.8 | 6 |
| 7.2 | 4 |
7. Kim took Math1820 and received the following grades. Calculate her final grade.
| Assessment | Kim’s Marks | Weight of the Final Grade |
| Lab #1 | 70% | 5% |
| Lab #2 | 75% | 5% |
| Lab #3 | 60% | 5% |
| Lab #4 | 80% | 5% |
| Test #1 | 72% | 20% |
| Test #2 | 78% | 20% |
| Test #3 | 55% | 20% |
| Test #4 | 88% | 20% |
