Cross validation in kaggle Mobile like/dislike contest-

Hello Everyone

I have been trying to write code for this contest for the last 1 week. After watching the professor’s video, I tried 5-cross validation on it. Please have a look at how I tried CV.

This is giving me 5 values of b and 5 accuracies for 5 validation sets.

Then I am stuck. How to proceed with these observations? am I doing cross-validation correctly?
how to use the observations to predict the test dataset as I have now 5 values of b?

Thank you in advance