a professor teaches 3 sectionof introductory stats.
resultsof the midterm :
section # students writing exams mean gradeof students writing exams(%)
1 50 55
2 30 68
3 20 75
calculate the combinedgradeof all the students writing exams
plse respond ASAP thanks
Recall that mean = sum of scores divided by number of scores ⇒ sum of scores =frequency * meanSum of scores of class 1 = 5055 = 2750Sum of scores of class 2 = 3068 = 2040Sum of scores of…