Conditional Probability Quiz
12 Questions
| Total Attempts: 836
This is a self-check quiz on probability. Take this quiz and see how well do you know about it!
Questions and Answers
- 1.The letters of the name SMISS are arranged in a line. If an arrangement is chosen at random, what is the probability that the three Ss are together?
- A.
0.6
- B.
0.3
- C.
0.1
- D.
0.4
- 2.A box contains 36 marbles. If a marble is picked at random, the probability of being red is 2/9. How many red marbles should be added to make this probability 1/3?
- A.
6
- B.
4
- C.
12
- D.
9
- 3.An identity card is picked at random. What is the probability that the sum of the last two digits of its number is 9?
- A.
0.5
- B.
0.4
- C.
0.1
- D.
0.2
- 4.One of the 5 points (3, 2), (2, 1), (1, - 4), (5, 5) and (4, 6) is selected at random. What is the probability that it lies on the straight line 3x – 2y = 5?
- A.
0.4
- B.
0.2
- C.
0.1
- D.
0.5
- 5.The letters of the word “PROBABILITY” are written on cards and the cards are then shuffled. If a card is picked at random, find the probability that it will contain a vowel.
- A.
5/11
- B.
3/11
- C.
7/11
- D.
4/11
- 6.I have two 10-cent coins, three 20-cent coins, four 50-cent coins and five $1 coins in my pocket. If I choose a coin at random, find the probability that the coin is worth at least 50 cents.
- A.
4/7
- B.
3/7
- C.
9/14
- D.
5/14
- 7.A man tosses two fair dice. One is numbered 1 to 6 in the usual way and the other is numbered 1, 3, 5, 7, 9 and 11. Find the probability that the total of the two numbers shown is greater than 10.
- A.
7/12
- B.
5/12
- C.
1/2
- D.
1/4
- 8.A card is drawn at random from a normal pack of 52 cards. If A represents the event that the card drawn is a Queen and B represents the event that the card drawn is a Heart. Find P(A|B).
- A.
5/13
- B.
1/4
- C.
4/13
- D.
1/52
- 9.Two fair dice, one red and one blue, are tossed. What is the probability that the total of the numbers shown by the two dice exceeds 3?
- A.
1/3
- B.
1/4
- C.
11/12
- D.
1/12
- 10.A bag contains 30 balls. The balls are numbered 1,2,3,4 ….30. A ball is drawn at random. Find the probability that the number on the ball is a prime number.
- A.
8/9
- B.
2/3
- C.
1/3
- D.
4/9
- 11.An interview with 18 people revealed that 5 of the 8 women and 8 of the 10 men preferred drinking coffee to tea. What is the probability that if one person is selected from the group of 18 people, it is either a woman or someone who preferred to drink coffee than tea?
- A.
8/9
- B.
1/3
- C.
1/9
- D.
2/3
- 12.A computer generates 4-digit random numbers in the range 0000 to 9999 inclusive. Find the probability that the computer produces a random number that begins and ends with the digit 1.
- A.
1/10
- B.
1/4
- C.
1/1000
- D.
1/100
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