Practice Probability Questions and Answers

• A black and a red dice are rolled. Find the conditional probability of obtaining a sum greater than 9, given that the black die resulted in a 5.
• An instructor has a question bank consisting of 200 easy True / False questions, 300 difficult True / False questions, 400 easy multiple-choice questions a...
• If A and B are events such that P(A|B) = P(B|A), then which of the following is true
• A box of bulbs is inspected by examining three randomly selected bulbs drawn without replacement. If all the three bulbs are non-defected, the box is appro...
• There are three types of maggi masala maggi, aata maggi and vegetable maggi in a bag. The probability of picking a vegetable maggi at random is 6/11. The t...
• There are (m + 4) red roses, (m + 11) white roses and ‘m’ pink roses in a bag. If the probability of picking a pink rose is 5/16, then find the value o...
• There are (m + 6) red roses, (m + 12) white roses and ‘m’ pink roses in a bag. If the probability of picking a pink rose is 4/15, then find the value o...
• There are (m + 4) red roses, (m + 9) white roses and ‘m’ pink roses in a bag. If the probability of picking a pink rose is 3/10, then find the ...
• There are (m + 7) red roses, (m + 11) white roses and ‘m’ pink roses in a bag. If the probability of picking a pink rose is 5/18, then find the value o...
• A box contains 3 blue, 2 white and 4 red marbles. If a marble is drawn at random from the box, what is the probability  that it would be white.
• Which of the following cannot be the probability of an event?
• A box contains only three colors of balls- red, green and blue. What is the minimum number of balls that should be picked from the box to ensure that at le...
• A box contains only three colors of balls- red, green and blue. What is the minimum number of balls that should be picked from the box to ensure that at le...
• A box contains only three colors of balls- red, green and blue. What is the minimum number of balls that should be picked from the box to ensure that at le...
• A box contains only three colors of balls- red, green and blue. What is the minimum number of balls that should be picked from the box to ensure that at le...
• A box contains only three colors of balls- red, green and blue. What is the minimum number of balls that should be picked from the box to ensure that at le...
• A box contains only three colors of balls- red, green and blue. What is the minimum number of balls that should be picked from the box to ensure that at le...
• A box contains only three colors of balls- red, green and blue. What is the minimum number of balls that should be picked from the box to ensure that at le...
• A bag contains 5 green gems and 7 orange gems. If 2 balls are drawn random, then what is the probability that at least 1 gem is orange.
• A is trying to break a bulb by throwing balls at it. If he hits the bulb 5 times in every 7 throws and bulb breaks 3 times out of 15 hits, then find the pr...
• A bag contains black and white balls, such that the probability of picking a black ball is 4/7. If the probability of picking two black balls without repla...
• A is trying to break a bulb by throwing balls at it. If he hits the bulb 3 times in every 5 throws and bulb breaks 3 times out of 12 hits, then find the pr...
• A is trying to break a bulb by throwing balls at it. If he hits the bulb 3 times in every 10 throws and bulb breaks 3 times out of 13 hits, then find the p...
• A is trying to break a bulb by throwing balls at it. If he hits the bulb 4 times in every 11 throws and bulb breaks 3 times out of 7 hits, then find the pr...
• The names of 6 students from section A, 8 students from section B and 10 students from section C were selected. The age of all the 24 students was differen...
• The names of 6 students from section A, 7 students from section B and 8 students from section C were selected. The age of all the 21 students was different...
• The names of 10 students from section A, 12 students from section B and 14 students from section C were selected. The age of all the 36 students was differ...
• The names of 15 students from section A, 10 students from section B and 15 students from section C were selected. The age of all the 40 students was differ...
• The names of 17 students from section A, 18 students from section B and 19 students from section C were selected. The age of all the 54 students was differ...
• 10 rotten bananas are accidentally mixed with 140 good ones. It is not possible to just look at a banana and tell whether or not it is rotten. One banana i...
• 15 rotten bananas are accidentally mixed with 115 good ones. It is not possible to just look at a banana and tell whether or not it is rotten. One banana i...
• 16 rotten bananas are accidentally mixed with 155 good ones. It is not possible to just look at a banana and tell whether or not it is rotten. One banana i...
• 17 rotten bananas are accidentally mixed with 120 good ones. It is not possible to just look at a banana and tell whether or not it is rotten. One banana i...
• 18 rotten bananas are accidentally mixed with 132 good ones. It is not possible to just look at a banana and tell whether or not it is rotten. One banana i...
• 19 rotten bananas are accidentally mixed with 136 good ones. It is not possible to just look at a banana and tell whether or not it is rotten. One banana i...
• 20 rotten bananas are accidentally mixed with 134 good ones. It is not possible to just look at a banana and tell whether or not it is rotten. One banana i...
• 22 rotten bananas are accidentally mixed with 136 good ones. It is not possible to just look at a banana and tell whether or not it is rotten. One banana i...
• The probability of selecting a rotten egg randomly from a basket of 600 eggs is 0.14. What is the number of rotten eggs in the basket?
• The probability of selecting a rotten egg randomly from a basket of 1000 eggs is 0.16. What is the number of rotten eggs in the basket?
• The probability of selecting a rotten egg randomly from a basket of 250 eggs is 0.2. What is the number of rotten eggs in the basket?