Here below you can find my solution to the first exercise of lesson 13
https://colab.research.google.com/drive/1ZffcVkJbWHj-Nm-8nnuyZLIGs5m3ZJZM?usp=share_link
and here an article that concerns bias and variance from where I took some inspirations
https://towardsdatascience.com/bias-and-variance-in-linear-models-e772546e0c30