CBSE Guess > Papers > Question Papers > Class X > 2009 > Mathematics > Mathematics
Q. 8. The length of a minor arc is 
of the circumference of the circle. Write the measure of the angle subtended by the arc at the centre of the circle.
Ans. 80°
Sol .Length of a minor arc
=2/9circumferenceof a circle …….(Given
Q. 9. Write the lower limit of the median class in the following frequency distribution .
���| Classes. | 0–10 | 10–20 | 20–30 | 30–40 | 40–50 |
| Frequency. | 9 | 12 | 5 | 16 | 8 |
Ans. 20
Sol .
| Class | F | c.f |
| 0 - 10 | 8 | 9 |
| 10 - 20 | 12 | 12 |
| 20 - 30 | 5 | 26 |
| 30- 40 | 16 | 42 |
| 40- 50 | 8 | 50 |
MedianClassis 20-30
Lowerlimitof the median class is 20
Q. 10. Cards each marked with one of the numbers 6, 7, 8, …, 15 are placed in a box and mixed thoroughly. One card is drawn at random from the box. What is the probability of getting a card with number less than 10?
Ans .
Sol. Total no. of cards = 10
Number of cards less than 10 = 6, 7, 8, 9 i.e. 4
Reqd. probability = 
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