You have chosen broad-type leaves which are alternate. Click on the image which best represents the leaf composition of your sample.

    Are the alternate leaves simple, or sometimes with many close together on short "spur" shoots?

Are the alternate leaves pinnately compound (like a feather), the fruit a bright orange-red pome (multi-seeded and apple-like)? Hint: this is usually shrubby but can be tree-sized. Yes?

It is a Greene mountain-ash (Sorbus scopulina) (not a true ash).