Detailed Instructions: This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.
Q: Passage: Manning finished the year with a career-low 67.9 passer rating, throwing for 2,249 yards and nine touchdowns, with 17 interceptions. In contrast, Osweiler threw for 1,967 yards, 10 touchdowns and six interceptions for a rating of 86.4. Veteran receiver Demaryius Thomas led the team with 105 receptions for 1,304 yards and six touchdowns, while Emmanuel Sanders caught 76 passes for 1,135 yards and six scores, while adding another 106 yards returning punts. Tight end Owen Daniels was also a big element of the passing game with 46 receptions for 517 yards. Running back C. J. Anderson was the team's leading rusher 863 yards and seven touchdowns, while also catching 25 passes for 183 yards. Running back Ronnie Hillman also made a big impact with 720 yards, five touchdowns, 24 receptions, and a 4.7 yards per carry average. Overall, the offense ranked 19th in scoring with 355 points and did not have any Pro Bowl selections. Question: What was Ronnie Hillman's average yards per carry in 2015?
A:
4.7