Exercise 9.2: Types of Events

Probability: Types of Events

Exercise 9.2

1. A company manufactures 10000 Laptops in 6 months. Out of which 25 of them are found to be defective. When you choose one Laptop from the manufactured, what is the probability that selected Laptop is a good one.

Solution:

2. In a survey of 400 youngsters aged 16-20 years, it was found that 191 have their voter ID card. If a youngster is selected at random, find the probability that the youngster does not have their voter ID card.

Solution:

3. The probability of guessing the correct answer to a certain question is x/3. If the probability of not guessing the correct answer is x/5, then find the value of x .

Solution:

4. If a probability of a player winning a particular tennis match is 0.72. What is the probability of the player loosing the match?

Solution:

5. 1500 families were surveyed and following data was recorded about their maids at homes

A family is selected at random. Find the probability that the family selected has

(i) Both types of maids (ii) Part time maids (iii)No maids

Solution:

Answer:

Exercise 9.2

1. 0.9975

2. 209/400

 3. 15/8

4. 0.28

5.(i) 1/6 (ii) 43/75 (iii) 1/75