In the following table find, the average score of the students Marks (X) No.…
2025
In the following table find, the average score of the students
Marks (X) No. of students (f)
20 8
30 12
40 20
50 10
60 6
70 4
Answer: D. 41 — Solution: Find the mean (average) using the formula Mean = Σfx ÷ Σf. Step 1: Compute total frequency Σf = 8 + 12 + 20 + 10 + 6 + 4 = 60. Step 2: Compute Σfx…
- A.
39
- B.
40
- C.
39
- D.
41
Attempted by 24 students.
Show answer & explanation
Correct answer: D
Solution: Find the mean (average) using the formula Mean = Σfx ÷ Σf.
Step 1: Compute total frequency Σf = 8 + 12 + 20 + 10 + 6 + 4 = 60.
Step 2: Compute Σfx by multiplying each mark by its frequency and summing:
20 × 8 = 160
30 × 12 = 360
40 × 20 = 800
50 × 10 = 500
60 × 6 = 360
70 × 4 = 280
Now sum these products: Σfx = 160 + 360 + 800 + 500 + 360 + 280 = 2460.
Mean = Σfx ÷ Σf = 2460 ÷ 60 = 41.
Therefore the average score of the students is 41.