Booking.com Developer interview questions

/* You have rating (0-10) of the hotels per user in this format: scores = [ {'hotel_id': 1001, 'user_id': 501, 'score': 7}, {'hotel_id': 1001, 'user_id': 502, 'score': 7}, {'hotel_id': 1001, 'user_id': 503, 'score': 7}, {'hotel_id': 2001, 'user_id': 504, 'score': 10}, {'hotel_id': 3001, 'user_id': 505, 'score': 5}, {'hotel_id': 2001, 'user_id': 506, 'score': 5} ] Any given hotel might have more than one score. Implement a function, get_hotels(scores, min_avg_score) that returns a list of hotel ids that have average score equal to or higher than min_avg_score. get_hotels(scores, 5) -> [1001, 2001, 3001] get_hotels(scores, 7) -> [1001, 2001] */

system design, simple algorithm question