Meta Data Scientist interview questions

Interviewer was friendly and professional, willing to give hints when stuck. I applied via referral. A week later was contacted by HR. Followed by HR phone screen, which consists of several SQL conceptual question. Second round: SQL queries followed by product sense question. The whole process took about 5 weeks.

HR phone interview: asked questions like how to predict samsong phone sales(not mentioned monthly or weekly)? how to predict churn rate? what is Recall metric, can you explain from scratch?