Statistics and Probability (IMO Mathematics Olympiad Class 9): Questions 48  54 of 101
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Passage
A car is going on a long journey for 16 hours, starting at 5.00 hrs. The speed of the car at different hours is given below:
Time (in hrs):

5

7

9

11

13

17

15

19

21

Speed (in km/hour):

40

50

60

80

70

65

75

60

50

From the above table answer the following questions.
Question number: 48 (2 of 3 Based on Passage) Show Passage
» Statistics and Probability
Question
The percentage of decrease in speed during 19.00 hrs and 21.00 hrs is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 49 (3 of 3 Based on Passage) Show Passage
» Statistics and Probability
Question
The percentage of increase in speed during 9.00 hrs and 11.00 hrs is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 50
» Statistics and Probability
Question
The median of the observation 30, 91, 0, 64, 42, 80, 30, 5, 117, 71 is ________
Choices
Choice (4)  Response  

a.  53 

b.  51 

c.  52 

d.  52.5 

Question number: 51
» Statistics and Probability
Question
A die is thrown once. The probability of getting a number greater than 3 is ________
Choices
Choice (4)  Response  

a. 


b. 


c.  0 

d. 


Question number: 52
» Statistics and Probability
Question
The average of n numbers is A. if is replaced by is replaced by , …, then the new average is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 53
» Statistics and Probability
Question
The King, queen and jack of clubs are removed from a deck of 52 cards and then wellshuffled. One card id selected from the remaining cards. The probability of getting a black card is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 54
» Statistics and Probability
Question
Average weight of 9 persons is 48 kg. If one man weighing 32 kg, died, what is an average age of the remaining 8 persons.
Choices
Choice (4)  Response  

a.  50 

b.  52 

c.  54 

d.  56 
