In the 8th class, consisting of 30 students, a Mathematics test was taken. 10 students had an average score of 90. The other
students had an average score of 75. What is the average score of the whole class?

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Accepted Answer

Step 1: Calculate the total score of the first group of 10 students.  
Total score = Number of students × Average score = 10 × 90 = 900

Step 2: Calculate the total score of the remaining students.  
Number of remaining students = 30 - 10 = 20  
Total score = 20 × 75 = 1500

Step 3: Calculate the total score of the whole class.  
Total score = 900 + 1500 = 2400

Step 4: Calculate the average score of the whole class.  
Average = Total score / Total number of students = 2400 / 30 = 80

Therefore, the average score of the whole class is 80.

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