Statistics and Probability (IMO Mathematics Olympiad Class 9): Questions 91  96 of 101
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Question number: 91
» Statistics and Probability
Question
A number x is chosen at random from the numbers 3, 2, 1, 0, 1, 2, 3. The probability that is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 92
» Statistics and Probability
Question
A box contains 12 balls out of which x are black. If one ball is drawn at random from the box, what is the probability that it will be a black ball? If 6 more black balls are put in the box, the probability of drawing a black ball is now double of what is was before, then x is________
Choices
Choice (4)  Response  

a.  3 

b.  7 

c.  5 

d.  2 

Passage
A Bus is going on a long journey for 25 hours, starting at 6.00 hrs. The speed of the car at different hours is given below:
Time (in hrs):

6

8

9

13

14

18

20

22

25

Speed (in km/hour):

30

60

50

40

60

70

80

60

20

From the above table answer the following questions.
Question number: 93 (1 of 3 Based on Passage) Show Passage
» Statistics and Probability
Question
The percentage of increase in speed during 14.00 hrs and 18.00 hrs is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 94 (2 of 3 Based on Passage) Show Passage
» Statistics and Probability
Question
The percentage of decrease in speed during 22.00 hrs and 25.00 hrs is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 95 (3 of 3 Based on Passage) Show Passage
» Statistics and Probability
Question
The average speed (in km/hour) between 6.00 hrs, 8.00 hrs, 9.00 hrs and 13.00 hrs is ________
Choices
Choice (4)  Response  

a.  45 

b.  67 

c.  48 

d.  96 

Question number: 96
» Statistics and Probability
Question
In a class test, in Science, 45 students scored 88 marks, 15 students scored 75 marks and 5 scored 60 marks. The mean of their score is (approximately) ________
Choices
Choice (4)  Response  

a.  75 marks 

b.  83 marks 

c.  80 marks 

d.  90 marks 
