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

For a constant K ,the variance of K.

• Zero A
• A^-2 B
• K C
• None of these D

Var (KY) = ......................

• KY A
• K² Var(Y) B
• K²Var (Y) C
• None of these D

Events with equal probabilities are called.

• Mutually exclusive events A
• Exhauative events B
• Eqauily likely events C
• Simple events D

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

• E(x) A
• -7X B
• -7E(X) C
• Zero D

F(-∞) is always equal to.

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

The probability of an impossible event is.

• Positive A
• Zero B
• Negative C
• 1 D

Tossing two dice possble sampes are.

• 2 A
• 6 B
• 12 C
• 36 D

A random variable is also called.

• Chance variable A
• Stochastic variable B
• Discrete variable C
• Both A and B D

• 4/10 A
• 2/10 B
• 1/10 C
• 0 D

A student soved 25 questions from first 50 questios of a book to be solved. The prob, that he will solve the remaining all questions.

• 0.25 A
• 0.51 B
• 1 C
• 0 D

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

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

What is the probability that a value chosen at random from a particular population is larger than the median of the popultion.

• 0.25 A
• 0.5 B
• 1.0 C
• 0.67 D

When two coins are tossed simultaneously, P (one head ) is.

• 1/2 A
• 1/4 B
• 3/4 C
• 1.0 D

For two independent random variables, Var(x) = 14 and Var(Y ) = 5, then var (X-y) is equal to.

• 9 A
• 70 B
• 19 C
• None of these D

the term 'event' is used for.

• Time A
• Subaet of the sample space B
• Total number of outcomes C
• Probability D

The probability of continuous random variable at x = a is__________.

• One A
• Zero B
• Between C
• More then one D

a measure of the chance that an uncertain event will occur.

• An experiment A
• An event B
• A probability C
• A trail D