Average coefficient of friction

[Bones]

Homework Statement

A skier traveling 11 m/s reaches the foot of a steady upward 22° incline and glides 13 m up along this slope before coming to rest. What was the average coefficient of friction?

Homework Equations

The Attempt at a Solution

Can someone help me get started by helping me with the equation and figuring out how mass cancels out?

 

[Bones]

I figured this one out ;)