# Probability-Probability Distributions (ISS (Statistical Services) Statistics Paper I (New 2016 MCQ Pattern)): Questions 72 - 75 of 109

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## Question number: 72

» Probability » Probability Distributions » Lognormal

MCQ▾

### Question

Suppose that has the lognormal distribution with parameters and . The distribution of is a 2-parameter exponential family with natural statistics given by________.

### Choices

Choice (4) Response

a.

b.

c.

d.

All of the above

## Question number: 73

» Probability » Probability Distributions » Joint and Marginal Distributions

MCQ▾

### Question

and are discrete random variables which are jointly distributed with the following probability function

 x -1 0 1 1 Y 0 0 -1

What is the value of ?

### Choices

Choice (4) Response

a.

b.

c.

d.

All of the above

## Question number: 74

» Probability » Probability Distributions » Lognormal

MCQ▾

### Question

Which of the following properties is/are satisfied by the probability density function of the lognormal distribution with parameters and .

### Choices

Choice (4) Response

a.

increases and then decreases with mode at

b.

is concave upward then downward then upward again, with inflection points at

c.

as and as

d.

All a. , b. and c. are correct

## Question number: 75

» Probability » Probability Distributions » Joint and Marginal Distributions

MCQ▾

### Question

If is the density function for the joint distribution of the continuous random variables and defined over the unit square bounded by the points and then the value of is ________.

### Choices

Choice (4) Response

a.

b.

c.

d.

None of the above

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