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A school has five houses A, B, C, D and E. A class has 23 students, 4 from house A, 8 from house B, 5 from house C, 2 from house D and rest from house E. A single student is selected

By   May 16, 2023
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question : 9. A school has five houses A, B, C, D and E. A class has 23 students, 4 from house A, 8 from house B, 5 from house C, 2 from house D and rest from house E. A single student is selected at random to be the class monitor. The probability that the selected student is not from A, B and C is :

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correct answer :

explanation of correct answer :

Total number of students (Total outcomes) = 23

Students from A house = 4

Students from B house = 8

Students from C house = 5

Students from D house = 2

Students from E house = 23 – (4+8+5+2) = 4

Students must not be selected from A , B , C means the student from D , E

Total D and E students (Favourable outcomes) = 2 + 4 = 6

as we know the formula of Probability –

Probability = Favourable outcomes/ Total outcomes

Probability that the selected student is not from A, B and C  means the Probability that the selected student is from D and E

Probability = Favourable outcomes/ Total outcomes

Probability = 6/23

means the Probability that the selected student is not from A, B and C is 6/23. that is why we have marked b option as our correct answer.

question : 1. An event is very unlikely to happen. Its probability is closest to:

question 2. If the probability of an event is P, the probability of its complementary event will be :

Question : 3. If P(A) denotes the probability of an event then :

question 4 : A card is drawn from a deck of 52 cards. The event E is that card is not an ace of hearts. The number of outcomes favorable to E is :

question : 5. The probability of getting a bad egg in a lot of 400 is 0.035. The number of bad eggs in the lot is :

question : 7. One ticket is drawn at random from a bag containing tickets numbered 1 to 40. The probability that the selected ticket has a number which is a multiple of 5 is :

question : 9. A school has five houses A, B, C, D and E. A class has 23 students, 4 from house A, 8 from house B, 5 from house C, 2 from house D and rest from house E. A single student is selected at random to be the class monitor. The probability that the selected student is not from A, B and C is :

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