Q. 9. Cards bearing numbers 3 to 20 are placed in a bag and mixed thoroughly. A card is taken out from the bag at random. What is the probability that the number on the card taken out is an even number?
Sol. Cards with even number are 4, 6, 8, 10, 12, 14, 16, 18, 20 i.e., 9
Total number of cards = 18
Ans . 
Q. 10. What measure of central tendency is obtained graphically as the x-coordinate of the point of intersection of the two ogives for grouped data?
Ans. Median
SECTION B
Questions number 11 to 15 carry 2 marks each.
Q.11. Find a quadratic polynomial whose zeroes are 1 and – 3. Verify the relation between the coefficients and zeroes of the polynomial.
Sol. Sum of zeroes = 1 + (– 3) = – 2
Product of zeroes = 1 (– 3) = – 3
Quadratic polynomial is
Q.12. If A, B and C are interior angles of a triangle ABC, then show that . 
Sol.
| Mathematics 2008 Question Papers Class X | |||||||
| Delhi | Outside Delhi | Compartment Delhi | Compartment Outside Delhi | ||||
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