PS_CH-2_QB

A random variable is also called

• Constant

• Variable

• Attribute

• Chance Variable

Suppose, four coins are tossed, the value of a random variable H (No. of heads) is:

• 1,2,3,4

• 0,1,2,3,4

• 0,1,2,3

• 0,1

If x is a discrete random variable, the function f(x) is

• Distribution function

• Probability function

• Density function

• None of these

The sum of probabilities of a discrete random variable is

• Zero

• Four

• Three

• One

A random variable assuming only a finite number of values is called:

• Discrete random variable

• Continuous random variable

• Random variable

• None of these

Height measurements of 50 students studying in a college

• Discrete variable

• Random variable

• Constant

• Continuous variable

The number of students in a class is an example of

• Continuous variable

• Discrete variable

• Definite variable

• None of these

A random variable assuming an infinite number of values is called

• Absolute variable

• Discrete random variable

• Continuous random variable

• None of these

If X and Y are random variables then E(X+Y) is equal to

• E(X)+E(Y)

• E(X)-E(Y)

• E(X)+Y

• None of these

A variable which can assume each and every value within a given range is called

• Discrete variable

• Random variable

• Qualitative variable

• Continuous variable