In Thumbtack, users are able to rate Pros based on their experience working with them. Each rating is an integer ranging from 1 to 5, and all ratings are averaged to produce a single number rating for any given Pro. Those Pros who have a rating lower than a specified threshold are manually reviewed by Thumbtack staff to ensure high quality of service. You're given a list of ratings for some Pros. Find out which Pros should be manually reviewed.
