In a city with three high schools, all the ninth graders took a Standardized Test, with these results: High School Mean Test Score Number of ninth graders (Frequency) The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was the average of 78, 94, and 72, which is 81.3. Of course, that is incorrect. What is the mean score for all ninth graders in the city? Round to one decimal place. Mean of all ninth grader's scores = C] The grading weight scheme and Tristan's grades in a astronomy class are summarized in the table: 96 of Final Grade _I _I Research Paper 95 Exam 63 Compute Tristan's final grade in the class as an overall percent. Give result to 2 decimal places. #96 Find the measures of center for following. Frequency mean = C] (round to 4 decimal places}