ACET (Actuarial Common Entrance Test) Statistics: Questions 186  189 of 201
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Question number: 186
» Measures of Spread » Variance
Question
Which of the following statements is correct?
Choices
Choice (4)  Response  

a.  The variance of the sum or difference of any two variables is equal to the sum of their respective variances  
b.  The variance is positive quantity and is expressed in square of the units of the observation  
c.  The standard deviation of a constant is equal to unity  
d.  The standard deviation is not independent of change of origin 
Question number: 187
» Measures of Spread » Standard Deviation
Question
Find the standard deviation & coefficient of variation when the followings are given
Variance
Choices
Choice (4)  Response  

a.  2,10%  
b.  16,2.5%  
c.  2,5%  
d.  16,5% 
Question number: 188
» Discrete Distributions » Poisson
Question
In a telephone enquiry system, the number of phone calls regarding relevant enquiry follow poisson distribution with an average of five phone calls during 10minute time intervals. The probability that there is at the most one phone call during a 10 minute time period is
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 189
» Probabilities » Basic Rules of Probabilities
Question
Let X and Y be two events such that which of the following is incorrect?
Choices
Choice (4)  Response  

a. 
 
b.  X and Y are independent  
c. 
 
d.  Question does not provide sufficient data or is vague 