Statistics and Probability (IMO Mathematics Olympiad Class 9): Questions 29  35 of 101
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Question number: 29
» Statistics and Probability
Question
The median of the observation 3, 5, 9, 5, 4, 3, 1 is ________
Choices
Choice (4)  Response  

a.  5  
b.  3  
c.  4  
d.  1 
Question number: 30
» Statistics and Probability
Question
If the mode of the following data 6, 8, 7, 6, x, 6, 4, 8, 7, 4, 8, 7 is 6, then value of x is ________
Choices
Choice (4)  Response  

a.  8  
b.  6  
c.  4  
d.  1 
Question number: 31
» Statistics and Probability
Question
The mean weight of 60 students in a class is 40 kg. The mean weight of boys is 50 kg while that of the girls is 30 kg. the number of boys and girls are________
Choices
Choice (4)  Response  

a.  20, 40  
b.  30, 30  
c.  35, 25  
d.  25, 35 
Question number: 32
» Statistics and Probability
Question
A contractor employed 10 labourers at Rs. 60 each per day, 12 labourers at Rs. 40 each per day, 8 labourers at Rs. 20 each per day and 6 labourers at Rs. 10 each per day. The average wages paid is ________
Choices
Choice (4)  Response  

a.  Rs. 60  
b.  Rs. 36  
c.  Rs. 26  
d.  Rs. 40 
Question number: 33
» Statistics and Probability
Question
A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball is double that of a red ball, find the n umber of blue balls in the bag.
Choices
Choice (4)  Response  

a.  15  
b.  10  
c.  5  
d.  20 
Question number: 34
» Statistics and Probability
Question
Two coins are tossed simultaneously. The probability of getting at least one head is ________
Choices
Choice (4)  Response  

a. 
 
b. 
 
c.  0  
d. 

Question number: 35
» Statistics and Probability
Question
The mean of 13 observations is 14. If the mean of the first 7 observations is 12 and that of the last 7 observations is 16, then the 7^{th} observation is ________
Choices
Choice (4)  Response  

a.  12  
b.  16  
c.  14  
d.  18 