Uber CEO Dara Khosrowshahi said he's trying to raise his rating from 4.83. John Nacion/Getty Images Uber gives riders and drivers ratings to incentivize good behavior on the platform. The CEO of Uber shows that getting five out of five stars can be tough. Not to worry, though; Uber says the average rider has a rating of 4.89. If you've ever chased that elusive five-star rating on the Uber app , you're not alone. The company's CEO doesn't have a perfect score. Dara Khosrowshahi said in an interview on Molly O'Shea's Sourcery, published Friday, that his Uber rating is 4.83. "My Uber rating is like 4.83," the CEO said. "I gotta get to 4.9." That's a little under the average Uber rider rating of 4.89, according to a company blog. Uber has said that it gives ratings to drivers and riders to ensure safety and accountability on the platform. Users who receive a rating below a certain threshold risk being booted from the app, though the company doesn't specify the exact minimum rating.…