Answer
2.25 ounces of trail mix in each service
Step-by-step explanation
First we need to find the ounces of trail mix by adding the ounces of granola and the ounces of raisins:


Now we just need of divide the ounces of trail mix by the servings:
Trail mix per service =

We can conclude that there will be 2.25 ounces of trail mix per service.