Final answer:
Each hiker receives 6 ounces of trail mix.
Step-by-step explanation:
To find out how many ounces of trail mix each hiker receives, we need to add up the weights of all the ingredients and divide by the number of hikers.
1 and one eighth pounds is equal to 18 ounces, 12 ounces of raisins, 11 ounces of walnuts, and 7 ounces of pretzels.
So the total weight of the trail mix is 18 + 12 + 11 + 7 = 48 ounces.
Dividing 48 ounces by 8 hikers gives us 6 ounces of trail mix per hiker.
Therefore, each hiker receives 6 ounces of trail mix.