class IX math ( probability )

                                                      Class IX-Mathematics  ( probability)

                                                      MULTIPLE CHOICE QUESTIONS

1.  Empirical probability of an event is also known as

     (a) an experimental probability

     (b) a theoretical probability

     (c) theoretical expectation of a chance

     (d) None of these

2.  An experiment is performed 350 times and there are three possible events A, B and C in an             experiment.Possible occurrence of three events are recorded. Which among the following records 

are possible.

    (a) A: 176, B : 80, C:94

    (b) A:90, B: 0, C: 250

    (c) A: 200, B : 100, C: 50

    (d) A: 110, B : 110, C: 110

3.  Probability of an event E of an experiment is

    (a)Number of trials in which event E has no happened /Total number of trials

     (b) Ratio of the number of trials in which event E has happened to the total number of trials.

    (c) Number of trials in which event E has happened/Total number of trials

     (d) None of these

4. Events E1, E2, E3 are the possible events of an experiment and their probabilities are recorded. Mark

    the possible correct answers

   (a) P(E,)=0.3, P(E2)= 0.4, P(E3) = 0.3  

   (b) P(E,)=0.1, P(E2)=0.4,P(E3)=0.5

   (c) P(E1)=0.6, P(E2)=0.3, P(E3) = 0.7

   (d) P(E,)= 0.4, P(E2)=0.2, P(E3)= 0.7

5. In class 9th of a particular school, probability of chosing a boy is 0.48. If there are 96 boys in class

   9th, then the total number of students in class 9th are

   (a) 480     (b) 192    (c) 200     (d) 96.48

6.The probability of happening of an event is 37%. Then probability of the event is

   (a) 37         (b) 0.037      (c) 3.7         (d) 0.37

7. The probability of selecting a boy in a class is 0.6 and there are 45 students in a class, then the

   number of girls in the class are

   (a) 36          (b) 27           (c) 20               (d) 18

8. Three coins are tossed simultaneously 1000 times and we get the following observations. Three

    heads=216, Exactly 2 heads=384,Exactly 1 head=270,No heads=130

     The probability of non-occurrence of exactly 2 heads is

    (a) 0.616     (b) 0.384     (c) 0.4                 (d) 61.6%

9.In the year 2009, during rainy season of 90 days, it was observed that it rained 20 days only. Then the

   probability that is did not rain is

    (a) 2/6     (b) 70      ( c) 7/9         (d) 9/7

10. While working out a question on probability it was found that there were 286 letters of English

       alphabet. The following was observation of occurrence of each letter

     a: 70, b : 14, e=26,r:60, i=36;

     others (not including vowels)= 100

     Then probability of a vowel is

     (a) 90 /286           (b)36/286     (c)  100 /286      (d)  132 /286

11. The following table represents the weight of 50 students in a particular class

      Weight (in kg)                   50-55          55-60       60-65    65-70

      Number of students                8               27             12           3

     Then the probability of a student having weight less than 60 kg is

     (a) 27 /100     (b)  35/50        (c) 27/50      (d) 15/50

12.To know the opinion of students about the chapter probability, a survey of 200 students was                      conducted and the result was: students like the chapter : 160 students dislike the chapter: 40 

      Then the probability that a student like the chapter is

      (a) 0.16       (b) 0.14       (c) 0.8       (d) 0.7

13. In a class there are x boys and y girls. A student is selected at random, then probability of selecting

      a girl is

     (a)x/y       (b) y/x+ y      (c) x/x+ y    (d) y/x

14. The probabilities of a student getting A, B, C and D grade (D being lowest) are 0.35, 0.25, 0.35 and

      0.05, then the probability that a student gets at most grade C is

      (a) 0.35         (b) 0.40         (c) 0.95     (d) 0.65

15. In a medical examination of students of a class, the following blood groups are recorded:

     Blood group                 A         AB          B        O

     Number of students     10        13           12        5

     Astudent is selected at random from the class. The probability that he/she has blood group B is:

     (a) 1/4       (b) 13/40      (c) 3/10       (d) 1/8

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