ACET (Actuarial Common Entrance Test) Statistics: Questions 56  59 of 201
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Question number: 56
» Discrete Distributions » Poisson
Question
Exclusive Vines import Argentinian wine into Australia. They’ve begun advertising on Facebook to direct traffic to their website where customers can order wine online. The number of click through sales from the ad is Poisson distributed with a mean of 12 click through sales per day. The probability of getting exactly 10 click through sales in the first day is given by
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 57
» Discrete Random Variables » Definitions
Question
Two variables are said to be perfectly negatively correlated if
Choices
Choice (4)  Response  

a.  Coefficient of correlation between them is 1  
b.  Covariance between them is positive  
c.  Correlation coefficient is positive  
d.  Correlation coefficient is negative 
Question number: 58
» Measures of Spread » Standard Deviation
Question
The positive square root of the mean of the squares of the deviations of observations from their mean is known as
Choices
Choice (4)  Response  

a.  Mean Deviation  
b.  Variance  
c.  Range  
d.  Standard Deviation 
Question number: 59
» Probabilities » Bayes Theorem
Question
A problem in statistics is given to three students A, B and C whose chances of solving it are , ¼ and ½ respectively. What is the probability that the problem will be solved?
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 
