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

The probability of red card out of 52 cards is.

• 1/4 A
• 1/2 B
• 4/52 C
• zero D

If x and y are independent random variables, E(xy)

• E(XY) A
• xE(y) B
• E(XY) C
• E(X) . E(Y) D

• 4/10 A
• 2/10 B
• 1/10 C
• 0 D

The coins are tossed, the porbability of two tails is euql to.

• 1/2 A
• 1/4 B
• 3/4 C
• 1 D

F(-∞) is always equal to

• Zero A
• One B
• Two C
• Negative one D

E(Y2) -[E(y)]2 is the formula, and to compute.

• Variance of the random variable A
• Mean of the random variable B
• Both A and B C
• None of these D

If x is a random variable with E(x) = 5 then E(3x - 2) =

• 0 A
• 1 B
• 13 C
• All of them D

the collection of all possible outcome of a random experimnet is called.

• Sample point A
• Sure event B
• sample event C
• simple event D

The sum of probabilities of events of a sample space is always.

• Equal A
• Discrete B
• Continuous C
• Always greater then oen D

When two dice are rolled, the numebr of possible sample points is.

• 6 A
• 12 B
• 36 C
• 48 D

E(y-μ) is equal to

• E(y) A
• μ B
• zero C
• y-μ D

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

For a constant k, the variance of k is

• zero A
• k² B
• k C
• none of these D

When three coins are tossed simulatneously, P(3 heads) is.

• 3/8 A
• 1/2 B
• 1/8 C
• 1/4 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

Which of the following is suitable for discrete probability distribution.

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

F (+∞) is always equal to:

• 0 A
• Two B
• One  C
• None of these D