ACET (Actuarial Common Entrance Test) Statistics: Questions 20  24 of 201
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Question number: 20
» Continuous Random Variables » Variance
Question
If the coefficient of correlation between X and Y is 0.28, covariance between X and Y is 7.6 and the variance of x is 9, then the standard deviation of Y series is:
Choices
Choice (4)  Response  

a.  9.05  
b.  10.1  
c.  10.05  
d.  9.8 
Question number: 21
Question
The average marks scored by 50 students in a class were calculated to be 38. Later it was found that the marks of one student was wrongly read as 14 instead of 41. Find the correct average marks.
Choices
Choice (4)  Response  

a.  38.45  
b.  38.54  
c.  38.20  
d.  38.7 
Question number: 22
» Discrete Distributions » Binomial
Question
Under which of the following circumstance, Binomial distribution is not used?
Choices
Choice (4)  Response  

a.  When the number of trials is indefinitely large  
b.  When the outcome of the random experiment results in the dichotomous events  
c.  All the trials are independent  
d.  All of the above 
Question number: 23
» Discrete Random Variables » Probabilities
Question
In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can two boys and two girls be selected?
Choices
Choice (4)  Response  

a.  30  
b.  90  
c.  24  
d.  Question does not provide sufficient data or is vague 
Question number: 24
» Continuous Distributions » The Normal Distribution
Question
A random variable X has the following probability distribution:
X  1  2  3  4  5  6  7 








Find
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 
