VALUE BASED QUESTIONS
Q1. Roshan is a wholesaler of electricbulbs. He sells a box of 600 electric bulbs which contains 12 defective bulbs to an electrician. He gives 12 extra bulbs to the electrician. In the process of replacing the defective bulbs by nondefective bulbs, the electrician takes out one bulb at random from the box.
(a) What is the probability that it is nondefective bulb?
(b) Which mathematical concept is used in the above problem?
(c) By giving 12 extra nondefective bulbs to the electrician, which value is depicted by Roshan?
Sol. (a) Total number of bulbs in the box = 600
Number of defective bulbs = 12
Number of nondefective bulbs = 600 – 12 = 588
Number of possible events = 600
Number of favourable events = 588
(b) Probability
(c) Honesty
Q2. There are 40 students in class X, of whom 25 are girls and 15 are boys. They plan to go to help the earthquake victims in a camp. Their classteacher has to select one student at random for the class representative.
(a) What is the probability that the student selected for classrepresentative is (i) a girl (ii) a boy
(b) Which mathematical concept is used in the above problem?
(c) By planning to go for the help of earthquake victims, which value is depicted by the students of class X?
Sol. (a) Total number of students in the class = 40
Number of boys = 15 Number of girls = 25
(i) Since, the class representative selected at random is to be a girl
∴ Number of possible outcomes = 40
Number of favourable outcomes = 25
[∵ There are 25 girls in the class]
∴ Probability of a girl to be the representative
(ii) Since, the classrepresentative selected at random is to be a boy
∴ Number of favourable outcomes = 15
⇒ Probability of a boy to be the representative =
(b) Probability
(c) Helping the persons, in need.
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1. What is probability and why is it important? 
2. How do you calculate the probability of an event? 
3. What is the difference between theoretical probability and experimental probability? 
4. How can probability be used in reallife situations? 
5. What is conditional probability and how is it calculated? 

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