First Year ICS Statistics Chapter 7 Online MCQ Test (Random Variables)

probability distribution of a continuous random variable can be presented by.

• Formula  A
• Curve B
• Tabular form C
• None of these
  
  
  D

If y =-7x then E(y) = ...............

• E(x) A
• -7X B
• -7E(X) C
• Zero D

Which of the following cannot be probability of an event.

• 0 A
• 1 B
• 0.32 C
• 1.00 D

When a pair of dice is rolled, the sum of upperemost dots vary from.

• 0 to 10 A
• 1 to 11 B
• 2 to 19 C
• 2 to 12 D

A set of numerical values assigned to a sample space is called.

• Random sample A
• Random variable B
• Random numbers C
• Random experiment D

The probability of getting one red ball from a bag constaining 4 red, 3 white and 3 black balls is.

• 3/10 A
• 1/5 B
• 2/5 C
• 1/2 D

E(x) = Σxf(x) if it ________ absolutely.

• Equal A
• Converges B
• Discrete  C
• None of these D

Random variable is also called ___________.

• Chance stochasitc A
• Coverges  B
• Random C
• None of these D

The probability of getting an odd number when a balanced die is rolled is.

• 1/2 A
• 1/3 B
• 1/4 C
• 1/6 D

The Area of trapezoid is equal to:

• sum of paralled sides x base A
• sum of paralled sides x base/2 B
• 2 x base x sum of paralled side  C
• Sum of paralled sides x base/4 D

If the random variable x denotes the number of heads when three distinct coins are tossed, the x assumes values

• 0, 1, 2, 3 A
• 1, 3, 3, 1 B
• 1, 2, 3 C
• None of these D

• 4/10 A
• 2/10 B
• 1/10 C
• 0 D

Which of the following is suitable for discrete probability distribution.

• Frequency polygon A
• Probability B
• Ogive C
• Histogram D

For discrete random variable 'X' the expectation of X I-e E(x) is equal to:

• Σp(x) A
• Σxp(x) B
• Σx²p(x) C
• One D

A probability function is _________ function.

• Mathematical A
• Mathematical expectation B
• Converges C
• None of these D

• y₁ = y₂ A
• Y₁ > y₂ B
• 
  C
• None of these D

Variance of σ² is equal E to (Y²) - _______?

• E (y) A
• [E(y)]² B
• E(y²) C
• None of these D