Mathematics [NSTSE (National Science Talent Search Exam Unified Council) Class 9]: Questions 684  690 of 989
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Question 684
Question
MCQ▾The mean of five numbers is 32. If one of the numbers is excluded the mean gets reduced by 4. The excluded number is
Choices
Choice (4)  Response  

a.  4  
b.  6  
c.  8  
d.  7 
Question 685
Question
MCQ▾The cost of painting the TSA of cone at is Rs. 140.80. The volume of the cone its slant height being 48 cm is
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question 686
Question
MCQ▾The daily sale of kerosene (in liters) in a ration shop for six days is as follows:
65,90,68,55,92.5 and 127.5 The average daily sale is
Choices
Choice (4)  Response  

a.  83  
b.  72  
c.  89  
d.  98 
Question 687
Question
MCQ▾Addition of rational numbers does not satisfy which of the following property?
Choices
Choice (4)  Response  

a.  Commutative  
b.  Associative  
c.  Closure  
d.  None of the above 
Question 688
Question
MCQ▾The mean of 9, x, 5, y and 13 is 8. Then
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question 689
Question
MCQ▾The division of two factors with unlike signs is ________.
Choices
Choice (4)  Response  

a.  Positive  
b.  Cannot be determined  
c.  Negative  
d.  Question does not provide sufficient data or is vague 
Question 690
Question
MCQ▾The probability for a randomly selected number out of 21,22,23,24, …. , 50 to be a prime number is
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 
