Probability Quiz Set 006

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Question 1

If P(E) = 0.28, then what is the probability of non-occurrence of E?

 A

0.72.

 B

0.28.

 C

0.5.

 D

0.25.

Soln.
Ans: a

P(E) + P(non-occurrence of E) is always = 1. So P(non-occurrence of E) = 1 - P(E) = 0.72.


Question 2

A class has 3 boys and 2 girls. What is the probability of choosing 1 boy and 2 girls?

 A

${3/10}$.

 B

$4/5$.

 C

$4/10$.

 D

$8/10$.

Soln.
Ans: a

Three students have to be picked. Total number of ways = 5C3 = ${5 × 4 × 3}/{3 × 2 × 1} = $10. Number of ways of picking 1 boy and 2 girls = 3C1 × 2C2 = 3. So probability = $3/10$ = ${3/10}$.


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

$9/11$.

 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

45 defective pens are accidentally mixed with 40 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

${9/17}$.

 B

$47/85$.

 C

$10/85$.

 D

$14/85$.

Soln.
Ans: a

Out of the total number of pens = 85, the chances favoring defective pen are 45. So the probability is 45/85 = ${9/17}$.


Question 5

What is the probability of getting a multiple of 2 when a dice is tossed in the air?

 A

1.

 B

1/2.

 C

1/4.

 D

0.

Soln.
Ans: b

Total outcomes are 6. The number of favorable chances are three: 2, 4, 6. So probability is 3/6 = 1/2.


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Creative Commons License
This Blog Post/Article "Probability Quiz Set 006" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2017-08-12.

Posted by Parveen(Hoven),
Aptitude Trainer


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