As you can see X2 dot products should be 0.5775, 0.27 and 0.1525. Not sure what happened cause next day X3 ends up correct but X2 adds up to 0.5575+0.27+0.1525= 0.84275
Thank you, Andy
Hi Andy,
Good spot! you are absolutely right.
There are visual typos on this slide for the X_2 calculation
The slide shows 0.5575 as you noticed and the correct calculation is
(0.80 × 0.45) + (0.45 × 0.35) + (0.30 × 0.20) = {0.5775}
Also the slide mistakenly displays an extra zero as 0.01525, whereas it should be:
(0.05 × 0.45) + (0.20 × 0.35) + (0.30 × 0.20) = {0.1525}
When using the correct values ({0.5775} + {0.27} + {0.1525}) the total adds up to 1.0 so which making it a valid probability distribution vector.
We hope you find this course both exciting and rewarding!
Great job , Andy !
Habibi Omar. I’m lebanese living in houston TX. May we connect please
Ahlen Andy 
Honored to connect with you, and warm greetings to Lebanon!
It’s always a pleasure to support dedicated learners like you in the community.
Feel free to reach out here anytime!