Probability Quiz Set 006

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Question 1

What is the probability of getting a sum of 2 from two throws of a dice?

 A

1/18.

 B

1/3.

 C

2/3.

 D

1/6.

Soln.
Ans: a

Total outcomes = 36. Favorable are 2, which are: (1, 1), (1, 1). Probability = 2/36 = 1/18.


Question 2

There are 40 students in Class X of a school of whom 25 are girls and 15 are boys. If one student is absent today, what is the probability that it is a girl?

 A

5/8.

 B

3/8.

 C

1/2.

 D

3/10.

Soln.
Ans: a

Outcomes favoring a girl are 25, so the probability is 25/40 = 5/8.


Question 3

A class has 5 boys and 3 girls. What is the probability of choosing 1 boy and 2 girls?

 A

${15/56}$.

 B

$6/8$.

 C

$16/56$.

 D

$20/56$.

Soln.
Ans: a

Three students have to be picked. Total number of ways = 8C3 = ${8 × 7 × 6}/{3 × 2 × 1} = $56. Number of ways of picking 1 boy and 2 girls = 5C1 × 3C2 = 15. So probability = $15/56$ = ${15/56}$.


Question 4

What is the probability of getting a sum of 13 from two throws of a dice?

 A

0.

 B

1/3.

 C

2/3.

 D

1/6.

Soln.
Ans: a

Total outcomes = 36. Favorable are 0 because maximum sum possible is 6 + 6 = 12. So probability = 0.


Question 5

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.


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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 2017-04-07.

Posted by Parveen(Hoven),
Aptitude Trainer


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