In a statistics class of 30 students, the mean score on the midterm was 72. In another class of 40 students, the mean score was 79. What was the mean score of the two classes combined?

1 Answer
Feb 5, 2016

Mean score of combined glasses = 76

Explanation:

Total score for class with 30 students and mean score of 72
color(white)("XXX")30xx72=2160

Total score for class with 40 students and mean score of 79
color(white)("XXX")40xx79=3160

Total number of student in combined classes
color(white)("XXX")30+40 = 70

Total of total class scores
color(white)("XXX")2160+3160 = 5320

Mean score for combine classes
color(white)("XXX")5320 div 70 = 76