x | f(x) | xf(x) |
0 | 0.10 | 0 |
1 | 0.20 | 0.2 |
2 | 0.28 | 0.56 |
3 | 0.24 | 0.72 |
4 | 0.18 | 0.72 2.2 = EV That is, the expected value of cars we can sell in a day. |