NCERT Exemplar Solutions
Class 10 - Mathematics - CHAPTER 13: Statistics and Probability - Exercise 13.3
Question 32

Question. 32

Cards numbered 2 to 101 are in a box (100 cards). Probability that the card has (i) an even number (ii) a square number?

Answer:

(i) \(\dfrac{1}{2}\), (ii) \(\dfrac{9}{100}\)

Detailed Answer with Explanation:

Step 1: Total number of cards = 100 (since numbers are from 2 to 101).

Part (i): Probability of an even number

• Even numbers are those divisible by 2 (like 2, 4, 6, ...).

• From 2 to 101, half of the numbers are even and half are odd.

• Total even numbers = 50.

• Probability = (Number of favourable cases) ÷ (Total cases)

• Probability = \(\dfrac{50}{100} = \dfrac{1}{2}\).

Part (ii): Probability of a square number

• A square number is of the form \(n^2\), where \(n\) is a whole number.

• The first square ≥ 2 is \(2^2 = 4\).

• The largest square ≤ 101 is \(10^2 = 100\).

• So the square numbers between 2 and 101 are: 4, 9, 16, 25, 36, 49, 64, 81, 100.

• Total = 9 square numbers.

• Probability = \(\dfrac{9}{100}\).

Final Answer:

(i) \(\dfrac{1}{2}\), (ii) \(\dfrac{9}{100}\).

NCERT Exemplar Solutions Class 10 – Mathematics – CHAPTER 13: Statistics and Probability – Exercise 13.3 | Detailed Answers