ICSE Class X Math 2016 Solved Paper
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The histogram below represents the scores obtained by 25 students in a Mathematics mental test. Use the data to :
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Question : 48 of 57
Marks:
+1,
-0
To calculate mean.
Solution:
| C.I | f | x | f.x |
|---|---|---|---|
| 0-10 | 2 | 5 | 10 |
| 10-20 | 5 | 15 | 75 |
| 20-30 | 8 | 25 | 200 |
| 30-40 | 4 | 35 | 140 |
| 40-50 | 6 | 45 | 270 |
| Σf=25 | Σf.x=695 |
Mean
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