Probability Quiz Set 015

Advertisement


Your Score
Correct Answers:
Wrong Answers:
Unattempted:

Question 1

A bag contains lemon flavored candies only. Malini takes out a candy without looking into the bag. What is the probability that she takes out an orange flavored candy?

 A

0.

 B

1.

 C

0.5.

 D

2.

Soln.
Ans: a

The bag contains lemon flavored candies only, so the probability of orange flavored candy being taken out is zero.


Question 2

What is the probability of getting a sum of 7 from two throws of a dice?

 A

1/6.

 B

1/3.

 C

6/7.

 D

7/6.

Soln.
Ans: a

Total outcomes = 36. Favorable are 6, which are: (1, 6), (6, 1), (2, 5), (5, 2), (3, 4), (4, 3). Probability = 6/36 = 1/6.


Question 3

A class has 6 boys and 5 girls. What is the probability of choosing 1 boy and 2 girls?

 A

${4/11}$.

 B

$7/11$.

 C

$5/11$.

 D

$9/11$.

Soln.
Ans: a

Three students have to be picked. Total number of ways = 11C3 = ${11 × 10 × 9}/{3 × 2 × 1} = $165. Number of ways of picking 1 boy and 2 girls = 6C1 × 5C2 = 60. So probability = $60/165$ = ${4/11}$.


Question 4

Three unbiased coins are tossed. What is the probability of getting at most two tails?

 A

7/8.

 B

3/8.

 C

1/8.

 D

5/8.

Soln.
Ans: a

Three coins will give 8 possibilities = 2 × 2 × 2. At most two tails means 1 or 2 tails. We will not get this only when all heads come, which is possible only once. So 8 - 1 = 7 chances are favorable. The probability = 7/8.


Question 5

A box contains 2 navy, 4 red and 6 sky blue marbles. What is the probability of drawing a marble that is not sky blue if 2 marbles are drawn out randomly?

 A

${5/22}$.

 B

$6/12$.

 C

$6/66$.

 D

$10/66$.

Soln.
Ans: a

Total number of marbles is 12. Combinations of 2 marbles that are possible = 12C2 = ${12 × 11}/2$ = 66. Chances of drawing a non-sky blue ball are 6C2 = $(6 × (6 - 1))/2$ = 15. So probability = 15/66 = ${5/22}$.


buy aptitude video tutorials


Creative Commons License
This Blog Post/Article "Probability Quiz Set 015" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2017-10-26.

Posted by Parveen(Hoven),
Aptitude Trainer


Advertisement