Question
A class of 30 students appeared in a test. The average
score of 12 students is 80, and that of the rest is 75. What is the average score of the class?Solution
To find the average score of the entire class, Calculate the total score of the first group (12 students with an average score of 80) = 12×80 = 960 Calculate the total score of the second group (18 students with an average score of 75) = 18×75 = 1350 Add the total scores of both groups = 960+1350 = 2310 Divide the total score by the total number of students (30) = 2310/30 = 77
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