The marks obtained out of 50, by 102 students in a Physics test are given in the frequency table below:
Find the average number of marks.
Marks (X): 15 20 22 24 25 30 33 38 45
Frequency (f): 5 8 11 20 23 18 13 3 1
Answers
The average number of marks = 26.08
Given:
- The marks obtained out of 50, by 102 students in a Physics test.
- Marks (X): 15 20 22 24 25 30 33 38 45
- Frequency (f): 5 8 11 20 23 18 13 3 1
To find:
The average number of marks.
Explanation:
- In question simply says that no. of student obtained 15 marks is 5,
- no. of student obtained 20 marks is 8 and so on.
- Average =
- Total no. of mark obtained = 15×5 + 20×8 + 22×11 + 24×20 + 25×23
+ 30×18 + 33×13 + 38×3 + 45×1
= 2660
Average = =
=26.08
The average number of marks = 26.08
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