Q. 29. A wooden article was made by scooping out a hemisphere from each end of a solid cylinder. If the height of the cylinder is 20 cm and radius of the base is 3.5 cm, find the total surface area of the article.
Sol. Total surface area of the article.
Q. 30. Find the mean, mode and median for the following data.
| Class | 0 - 10 | 10 - 20 | 20 - 30 | 30 - 40 | 40 - 50 | Total |
| Frequency | 8 | 16 | 36 | 34 | 6 | 100 |
Sol.
| Class | Freq.(fi) | cfi | xi | 
|
Fidi’ |
| 0 – 10 | 8 | 5 | -2 | -2 |  |
| 10 – 20 | 16 | 24 | 15 | -2 | 0 |
| 20 – 30 | 36 | 60 | 25 | 0 | |
| 30 - 40 | 34 |
94 | 35 |
1 |
|
| Total |  |
 |
| Mathematics 2008 Question Papers Class X | |||||||
| Delhi | Outside Delhi | Compartment Delhi | Compartment Outside Delhi | ||||
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All Sets(PDF) | |
Set 1 | |
Set 1 | ||
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Set 2 | |
Set 2 | ||||
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Set 3 | |
Set 3 | ||||
