Jenny likes to have at least a 70% average to pass her statistics class. Her previous four test scores are 52%, 66%, 76% and 71%. What is the minimum score Heidi needs on the final exam to pass the class?

To determine the minimum score Jenny needs on her final exam to achieve an average of at least 70% in her statistics class, we follow these steps:

Calculate the Total Current Points: Sum up Jenny's previous scores: 52%+66%+76%+71%=265%.

Determine the Desired Total Points for a 70% Average: Since Jenny wants an average of 70% and she will have taken 5 tests in total (including the final exam), the total percentage points needed to achieve this average is

70%×5=350%.

Find the Minimum Score Needed on the Final Exam: Subtract the total current points from the desired total points to find out how many percentage points Jenny needs on her final exam to reach her goal.

350%−265%=85%.

Therefore, Jenny needs to score at least 85% on her final exam to ensure her average reaches the desired 70% for the course.