A batch of 30 students took an intelligence test in an institution 20 of them scored an average of 7...........

Quantitative Aptitude (CHSL) Average

A batch of 30 students took an intelligence test in an institution. 20 of them scored an average of 75 marks and the remaining

students scored an average of 87 marks. What is the average score of the entire batch of students?

This questions was previously asked in

SSC CHSL 8th June 2022 Shift-3

- There are 30 students in total.

- The first group consists of 20 students with an average score of 75.

- The second group consists of 10 students with an average score of 87.

- To find the overall average, we calculate the total sum of scores for each group and divide by the total number of students.

- First group's total score: 20 students × 75 marks = 1500 marks.

- Second group's total score: 10 students × 87 marks = 870 marks.

- Combine both groups: Total score = 1500 + 870 = 2370 marks.

- Calculate average: Total score ÷ Total students = 2370 ÷ 30 = 79.

Option 1: 79 is correct.

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