Assume you are a data scientist working for the Victoria Police. According to the report from the accident investigation department, Mitsubishi EVO X seems to have more accidents than the other vehicles and they want to know some extra information about it. You have a dataset of the number of accidents related to Mitsubishi EVO X reported weekly. The dataset is as follows.

| Time period| Vehicle model| Number of reported cases|

| :------------- | :----------: | -----------: |

|Week 1 2021 | Mitsubishi EVO X| 9|

|Week 2 2021 | Mitsubishi EVO X| 9|

|Week 3 2021 | Mitsubishi EVO X|7|

|Week 4 2021 | Mitsubishi EVO X| 12|

|Week 5 2021 | Mitsubishi EVO X| 8|

|Week 6 2021 | Mitsubishi EVO X| 11|

|Week 7 2021 | Mitsubishi EVO X| 8|

|Week 8 2021 | Mitsubishi EVO X| 8|

We take X as the time interval between two accidents in the following calculation.

Based on this dataset, now it is your duty to find out

1. PDF(X)

2. CDF(X)

3. E(X)