My, thank you! I see I lack the elegance of the gentleman's (Your's) solution. Quite exquisite. ;)

Hey, thanks for the challenge!

I'd like to propose that You'd clarify in the description the fact that there exists multiple ways to calculate quartiles (or percentiles). Also, stating more clearly the way You're expecting Your padawan to go would be nice.

Though, maybe a student should stumble some upon wandering his path to do it proper. :)