How Do You Calculate the Coefficient of Friction?

[liz777]

Homework Statement

If a force of 150 newtions is needed for a 600 Newton weight to overcome friction, what is the coefficient of friction?

The Attempt at a Solution

I'm really confused, I drew a force diagram but it didnt help. I know I need to get the frictional force to solve for the coefficient of friction, but I'm not sure how to get it...

 

[Doc Al]

This is the same issue as in your other thread. See my comments there. The friction is given.