Probability Quiz Set 013

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Question 1

A bag contains three marbles 4 Red, 5 Green and 3 Blue. One marble is taken out. What is the probability of drawing a red marble.

 A

1/3.

 B

5/12.

 C

1/4.

 D

4/9.

Soln.
Ans: a

Total ways of drawing a marble = 4 + 5 + 3 = 12. Of these red marble can be drawn in 4 ways. So required probability = 4/12 = 1/3.


Question 2

49 defective pens are accidentally mixed with 84 good ones. It is not possible to just look at a pen and tell whether it is defective or not. One pen is taken out at random. What is the probability that it is a defective pen?

 A

${7/19}$.

 B

$51/133$.

 C

$8/133$.

 D

$12/133$.

Soln.
Ans: a

Out of the total number of pens = 133, the chances favoring defective pen are 49. So the probability is 49/133 = ${7/19}$.


Question 3

From a deck of 52 cards 1 card is drawn at random. What is the probability that it will be a red "8"?

 A

${1/26}$.

 B

$6/8$.

 C

$2/26$.

 D

$6/26$.

Soln.
Ans: a

Number of ways of drawing 1 card = 52. There are two red "8" in the whole pack. So favorable chances are 2. Probability = 2/52 = 1/26.


Question 4

A box contains 7 navy, 2 khaki and 3 orange balls. What is the probability of drawing a ball that is neither khaki nor navy?

 A

${1/4}$.

 B

$4/12$.

 C

$2/66$.

 D

$6/66$.

Soln.
Ans: a

Total number of marbles is 12. We have to basically find the probability of picking a orange ball, for which 3 chances are favorable. So probability = 3/12 = ${1/4}$.


Question 5

9 cones are lying inverted on a table. 2 of them contain balls, but 7 of them are empty. What is the probability of getting a ball if one of the cones is opened randomly?

 A

${2/9}$.

 B

$3/9$.

 C

$4/9$.

 D

$7/9$.

Soln.
Ans: a

Chances favoring a ball are 2, whereas the total chances are 9. The probability is 2/9 = ${2/9}$.


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Creative Commons License
This Blog Post/Article "Probability Quiz Set 013" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2019-08-18.

Posted by Parveen(Hoven),
Aptitude Trainer


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