Statistics and Probability (IMO Mathematics Olympiad Class 9): Questions 54  60 of 101
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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 

Question number: 55
» Statistics and Probability
Question
A card is drawn at random from a well shuffled pack of 52 cards. The probability that the ‘9’ of red color card is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Passage
A Train is going on a long journey for 20 hours, starting at 3.00 hrs. The speed of the car at different hours is given below:
Time (in hrs):

3

5

8

10

12

15

18

20

23

Speed (in km/hour):

60

70

90

50

60

75

60

30

60

From the above table answer the following questions.
Question number: 56 (1 of 3 Based on Passage) Show Passage
» Statistics and Probability
Question
The percentage of decrease in speed during 18.00 hrs and 20.00 hrs is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 57 (2 of 3 Based on Passage) Show Passage
» Statistics and Probability
Question
The average speed (in km/hour) between 10.00 hrs, 12.00 hrs and 15.00 hrs is ________
Choices
Choice (4)  Response  

a.  62 

b.  63 

c.  68 

d.  57 

Question number: 58 (3 of 3 Based on Passage) Show Passage
» Statistics and Probability
Question
The percentage of increase in speed during 10.00 hrs and 12.00 hrs is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 59
» Statistics and Probability
Question
Mean marks scored by 40 students were found to be 60. Later it was observed that a score of 48 was misread as 84. Then the correct mean is ________
Choices
Choice (4)  Response  

a.  59.1 

b.  58.2 

c.  59 

d.  58 

Question number: 60
» Statistics and Probability
Question
The mean of 20 items is 17 and if each item is increased by 3, then its mean will be ________
Choices
Choice (4)  Response  

a.  70 

b.  50 

c.  60 

d.  20 
