Your question is Market Sizing Case Study. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Walk me through a market sizing case study.
Explain how you would clarify the scope, choose a top-down or bottom-up approach, state assumptions, calculate the estimate, and test its reasonableness. Discuss how you would communicate uncertainty and adapt if the interviewer provides additional data.