Statistics Ics Part 1 Chapter 7 Online Test

The probability distribution of discrete random variable is called is

• Frequency distribution A
• Probability distribution B
• Probability mass function C
• Both (a) and (b) D

E(X ± Y) =..............

• E(X) + E(Y) A
• E(X) - E (Y) B
• E(x) ± E (Y) C
• None of these D

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

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

Random variable is also called ___________.

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

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

• E(xy) A
• xE(y) B
• E(x) C
• E(x)E(y) D

Events with equal probabilities are called.

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

If one event is unaffected by the outcome of another event, the two events are said to be

• Dependent A
• Independent B
• Mutually exclusive C
• Both b and c D

The simple probability of occurrence of an event in called the.

• Joint probability A
• Conditional probability B
• Marginal probability C
• Subjective probability D

F (+∞) is always equal to:

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

• y₁ = y₂ A
• Y₁ > y₂ B
• 
  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

The probability of red card out of 52 cards is.

• 1/4 A
• 1/2 B
• 4/52 C
• zero D

For a constant K ,the variance of K.

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

Var (B/aX) =?

• 1/aVar(X) A
• b²/a² Var(X) B
• b²/a Var(X) C
• None of these D

Which of the following is suitable for discrete probability distribution.

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

When two dice are rolled, the maximum totla on the two faces of dice will be.

• 2 A
• 6 B
• 12 C
• 36 D

The probability of an impossible event is.

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