Q. 9. Two friends were born in the year 2000. What is the probability that they have the same birthday?
Sol. Total number of days in a year 2000 = 366
Year 2000 is a leap year
They have the same birthday
Number of favourable days = 1
(they have the same birthday) =
Ans. 
Q. 10. What is the median class for the following grouped data?
| Class | Frequency |
| 128 135 | 8 |
| 135 142 | 5 |
| 142 149 | 9 |
| 149 - 156 | 12 |
| 156 163 | 5 |
| 163 170 | 1 |
Sol .
| Class | Freq.(f) | c.f. |
| 128 - 135 | 8 | 8 |
| 135 - 142 | 5 | 13 |
| 142 - 149 | 9 | 22 |
| 149 - 156 | 12 | 34 |
| 156 - 163 | 5 | 39 |
| 163 170 | 1 | 40 |
| Mathematics 2008 Question Papers Class X | |||||||
| Delhi | Outside Delhi | Compartment Delhi | Compartment Outside Delhi | ||||
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Set 3 | |
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