How would you use EXCEL GOAL SEEK to determine the score needed on the final exam to earn a weighted average of 90 points for the class (an A grade)? How would you use EXCEL GOAL SEEK to determine the score needed on the final exam to earn a weighted average of 90 points for the class (an A grade)? Set C8 to 97.25 by changing E9 Set E8 to 38.90 by changing C8 Set E9 to 90 by changing C8 Set C8 to 90 by changing E9