The table below summarizes the number of surface flaws found on the paintwork of new cars following their inspection after primer paint was applied by a new method:
| No. of flaws | No. of cars |
| 0 | 3 |
| 1 | 7 |
| 2 | 12 |
| 3 | 11 |
| 4 | 3 |
| 5 | 2 |
| 6 | 2 |
Part a) Find the mean number of flaws per car. Please give your answer to two decimal places.
The mean number of flaws per car is:
Part b)
Find the variance of the number of flaws per car. Please give your answer to two decimal places.
The variance of the number of flaws per car is: