Answer
The distribution is skewed right.
Work Step by Step
Q2 - Q1 = 335.5 - 255.3 = 80.2
Q3 - Q2 = 497.2 - 335.5 = 161.7
Since the difference between Q3 and Q2 is greater than the difference between Q2 and Q1 and the outlier is larger than Q3, we can safely say that the distribution is skewed right.