2.25 ounces of trail mix in each service
First we need to find the ounces of trail mix by adding the ounces of granola and the ounces of raisins:
[tex]TrailMix=23.5oz+10.5oz[/tex]
[tex]TrailMix=33.75oz[/tex]
Now we just need of divide the ounces of trail mix by the servings:
Trail mix per service = [tex]\frac{33.75oz}{15services} =2.25\frac{oz}{service}[/tex]
We can conclude that there will be 2.25 ounces of trail mix per service.