Clean Lecture 10 90% - TODO: Finish simpsons paradox

clean lecture 9 100%

Clean Lecture 8 100%

Clean Lecture 07 100%

Clean Lecture 6 100%

Clean Lecture_05 95%

Cleaning lecture 5 95%

cleaning lecture 3_4 70%

Lecture 20 Complete

Lecture_19_2023 complete

Lecture_19 90%

Lecture_19 85%

lecture 18 90%, add Lecture 19 50%

Update Lecture_18_2023.ipynb

Update Lecture_18_2023.ipynb