You are not likely to have 17.03800786369594 crashes if your Tesla is driven on autopilot for 130 miles.

The M suffix on 7.63 indicates million.

130 miles / 7630000 = 0.000017038 expected accidents while driving on Autopilot to your Mum's. You would have to make 58692.334781078 such trips before an expected accident. Suppose each trip takes 3 hours. That is 20.100114651 years of continuous driving. Probably you would not have an expected accident visiting your mum even if driving that trip was your sole activity.