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## Tamilnadu Samacheer Kalvi 9th Maths Solutions Chapter 9 Probability Ex 9.3

Question 1.

A number between 0 and 1 that is used to measure uncertainty is called

(1) Random variable

(2) Trial

(3) Simple event

(4) Probability

Solution:

(4) Probability

Question 2.

Probability lies between

(1) -1 and +1

(2) 0 and 1

(3) 0 and n

(4) 0 and ∞

Solution:

(2) 0 and 1

Question 3.

The probability based on the concept of relative frequency theory is called

(1) Empirical Probability

(2) Classical Probability

(3) Both (1) and (2)

(4) Neither (1) or (2)

Solution:

(1) Empirical Probability

Question 4.

The probability of an event cannot be

(1) Equal to zero

(2) Greater than zero

(3) Equal to one

(4) Less than zero

Solution:

(4) Less than zero

Question 5.

The probability of all possible outcomes of a random experiment is always equal to

(1) one

(2) Zero

(3) Infinity

(4) Less than one

Solution:

(1) one

Question 6.

If A is any event in S then its complement is A’ then, P(A’) is equal to

(1) 1

(2) 0

(3) 1 – A

(4) 1 – P(A)

Solution:

(4) 1 – P(A)

Question 7.

Which of the following cannot be taken as probability of an event?

(1) 0

(2) 0.5

(3) 1

(4) -1

Solution:

(4) -1

Question 8.

A particular result of an experiment is called

(1) Trial

(2) Simple event

(3) Compound event

(4) Outcome

Solution:

(4) Outcome

Question 9.

A collection of one or more outcomes of an experiment is called

(1) Event

(2) Outcome

(3) Sample point

(4) None of above

Solution:

(1) Event

Question 10.

The six faces of the dice are called equally likely if the dice is

(1) Small

(2) Fair

(3) Six-faced

(4) Round

Hint: Fair means all outcomes are equally likely.

Solution:

(2) Fair