Statistics and Probability (IMO Mathematics Olympiad (SOF) Class 9): Questions 30  35 of 101
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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 
