MathematicsStatistics (NTSE Stage1 (StateLevel) ScholasticAptitude & Language Comprehension): Questions 1  6 of 8
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Question number: 1
» Mathematics » Statistics
Question
If the mean of five observations x, x + 2, x + 4, x + 6 and x + 8 is 11, then the mean of first three observations is
Choices
Choice (4)  Response  

a.  11 

b.  13 

c.  9 

d.  12 

Question number: 2
» Mathematics » Statistics
Question
If the geometric mean of three observations 40, 50 and x is 10, then the value of x is
Choices
Choice (4)  Response  

a.  4 

b.  2 

c.  0.5 

d.  6 

Question number: 3
» Mathematics » Statistics
Question
A, B and C are three sets of value of x.
A: 2, 3, 7, 1, 3, 2, 3 B: 7, 5, 9, 12, 5, 3, 8 C: 4, 4, 11, 7, 2, 3, 4
Select the correct statement from among the following.
Choices
Choice (4)  Response  

a.  Median, mean and mode of A are same 

b.  Median of B is equal to mode of A 

c.  Mean of C is equal to median of B 

d.  Mean of A is equal to mode of C 

Question number: 4
» Mathematics » Statistics
Question
The mean of a set of number is x. If each number is divided by 3, then the new mean is
Choices
Choice (4)  Response  

a. 


b.  x 

c.  3x 

d.  x + 3 

Question number: 5
» Mathematics » Statistics
Question
The geometric mean of two numbers is 8 and their harmonic mean is 6.4. The numbers are
Choices
Choice (4)  Response  

a.  4, 16 

b.  2, 8 

c.  4, 8 

d.  Question does not provide sufficient data or is vague 

Question number: 6
» Mathematics » Statistics
Question
The combined mean of three groups is 12 and the combined mean of first two groups is 3. If the first, second and third groups have 2, 3 and 5 items respectively, then mean of third group is
Choices
Choice (4)  Response  

a.  10 

b.  18 

c.  12 

d.  21 
