Final answer:
To find the average bowling score, add up all the individual scores of the students and divide by the number of students (11). Hence, without information answer can not be predicted.
Step-by-step explanation:
To calculate the average score of the sixth-grade class party, we would need the individual scores of the 11 students who bowled. However, the actual scores are not provided in the question. Typically, to find an average, you would add up all of the individual scores and then divide by the number of scores.
If you have the scores, you can follow this formula: Average Score = (Sum of all scores) / (Number of scores). As we do not have the specific scores, we cannot calculate an exact average. If the possible answers are a standard part of the question and the student must choose from them.
We could find the average by using additional information that might be provided. However, since there is no such information provided here, we can only explain how one would generally find the average score once all individual scores are known.