3. (5 points) During a 13-day period, you are allowed to submit a project. The number of days a randomly selected student needed to submit is a RV with a symmetric PDF around x=6.5 and is given by: = 0 ≤ x ≤ 6.5 fx(x)=x+1 0 else A student submits at the 60% of this distribution. How many days the student needs to prepare the project?