ISS (Statistical Services) Statistics Paper I (New 2016 MCQ Pattern): Questions 204  209 of 471
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Question number: 204
» Probability » Discrete and Continuous Random Variables
Question
Which of the following cannot be the example of exponential random variable?
Choices
Choice (4)  Response  

a.  Number of pizza a person eats in a month. 

b.  The time until the next jobs arrives at a database server. 

c.  The distance we travel along a road until we find the next pothole. 

d.  All of the above 

Question number: 205
» Probability » Discrete and Continuous Random Variables
Question
A randomly chosen child repeatedly hits a bell. X is the length of time it takes to break it open. Is the random variable X discrete or continuous?
Choices
Choice (4)  Response  

a.  Continuous 

b.  Can’t say anything. 

c.  Discrete 

d.  Sometime discrete sometime continuous 

Question number: 206
» Probability » Probability Distributions » Uniform
Question
If , then what will be the standard deviation of ?
Choices
Choice (4)  Response  

a.  261.2 

b.  59.8 

c.  120.5 

d.  161.4 

Question number: 207
» Probability » Probability Distributions » Bernoulli
Question
Which of the following is skewness of a standardized Bernoulli distributed random variable which takes the value 1 with success probability of and the value 0 with failure probability of ?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 208
» Probability » Probability Distributions » Exponential
Question
The moment generating function of an exponential random variable X with parameter λ (for t < 1/ λ) is:
Choices
Choice (4)  Response  

a. 


b. 


c. 


d.  All of the above 

Question number: 209
» Probability » Probability Distributions » Normal
Question
Suppose marks of students in a test are normally distributed. If the test has a mean of 100 and a standard deviation of 10, what is the probability that a student who gives the test will score between 90 and 110?
Choices
Choice (4)  Response  

a.  0.84 

b.  0.68 

c.  0.16 

d.  All of the above 
