Statistics and Probability (IMO Mathematics Olympiad (SOF) Class 9): Questions 78  84 of 101
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Question number: 78
» Statistics and Probability
Question
Two dice are thrown simultaneously, the odds in favour of getting the sum 5 is________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 79
» Statistics and Probability
Question
The median of the observation 2,1, 12,29,25,12,10,4, 5 is ________
Choices
Choice (4)  Response  

a.  12 

b.  25 

c.  15 

d.  10 

Question number: 80
» Statistics and Probability
Question
The mean of 24 observations is 35. If the mean of the first 12 observations is 31 and that of the last 12 observations is 38, then the 12^{th} observation is ________
Choices
Choice (4)  Response  

a.  14 

b.  15 

c.  11 

d.  12 

Question number: 81
» Statistics and Probability
Question
In a mathematics test given to 15 students, the following marks (out of 100) is recorded: 45,56,78,54,75,34,68,98,87,99,90,76,55,77,68, then mean, median and mode of this data are respectively ________
Choices
Choice (4)  Response  

a.  60.67,75,65 

b.  70.67,77,68 

c.  70.67,75,68 

d.  55.26,78,65 

Question number: 82
» Statistics and Probability
Question
Average of 10 numbers is 12. What should be added as 11^{th} number to make the average 13?
Choices
Choice (4)  Response  

a.  28 

b.  25 

c.  30 

d.  23 

Question number: 83
» Statistics and Probability
Question
If the mean of 17 observations is 22 and that of another 18 observations is 10, then the mean of 35 observations is ________
Choices
Choice (4)  Response  

a.  24 

b.  15.83 

c.  15 

d.  24.8 

Question number: 84
» Statistics and Probability
Question
Two dice are thrown simultaneously. The probability of getting an even number as the sum is________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

