There are 25 servings in a 30.2 ounce jar of peanut butter. how many ounces of peanut butter are there in 1 serving?

It is important to first understand the requirement of the question. Based on the requirement, it can be seen that all the necessary information's are already available in the question.
The amount of peanut butter in 25 servings = 30.2 ounce
Then
The amount of peanut butter in 1 serving = 30.2/25 ounce
                                                                   = 1.208 ounce
                                                                   = 1.21 ounce
The amount of peanut butter in 1 serving is 1.21 ounce. I hope the procedure is clear to you and the answer given is what you were looking for.