Probability & Statistics
16 questions available
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Q1.If A and B are mutually exclusive events then?
Correct Answer: A
Q2.A box contains 8 red, 6 green and 7 blue toys. One of the toys is randomly picked; what is the probability that the toy picked is neither red nor green?
Correct Answer: A
P(neither red nor green) = P(blue) = 7/21.
Q3.A bag contains 11 balls, of which 5 are red. What is the probability of drawing a red ball?
Correct Answer: A
Probability = favourable outcomes ÷ total outcomes = 5/11.
Q4.A bag contains 12 balls, of which 6 are red. What is the probability of drawing a red ball?
Correct Answer: A
Probability = favourable outcomes ÷ total outcomes = 6/12.
Q5.A bag contains 13 balls, of which 7 are red. What is the probability of drawing a red ball?
Correct Answer: A
Probability = favourable outcomes ÷ total outcomes = 7/13.
Q6.A bag contains 14 balls, of which 8 are red. What is the probability of drawing a red ball?
Correct Answer: A
Probability = favourable outcomes ÷ total outcomes = 8/14.
Q7.A bag contains 15 balls, of which 9 are red. What is the probability of drawing a red ball?
Correct Answer: A
Probability = favourable outcomes ÷ total outcomes = 9/15.
Q8.A bag contains 16 balls, of which 10 are red. What is the probability of drawing a red ball?
Correct Answer: A
Probability = favourable outcomes ÷ total outcomes = 10/16.
Q9.A bag contains 17 balls, of which 11 are red. What is the probability of drawing a red ball?
Correct Answer: A
Probability = favourable outcomes ÷ total outcomes = 11/17.
Q10.A bag contains 18 balls, of which 12 are red. What is the probability of drawing a red ball?
Correct Answer: A
Probability = favourable outcomes ÷ total outcomes = 12/18.
Q11.A bag contains 19 balls, of which 13 are red. What is the probability of drawing a red ball?
Correct Answer: A
Probability = favourable outcomes ÷ total outcomes = 13/19.
Q12.A bag contains 20 balls, of which 14 are red. What is the probability of drawing a red ball?
Correct Answer: A
Probability = favourable outcomes ÷ total outcomes = 14/20.
Q13.A box contains 8 red, 6 green and 7 blue toys. One of the toy is randomly picked, what is the probability that the toy picked is neither red nor green?
Correct Answer: A
Correct answer is A: 7/21
Q14.A bag contains 3 red, 4 green, and 1 blue ball. If 1 more green ball is added, what is the new probability of picking a green ball?
Correct Answer: B
Initial total = 8. Adding 1 green ball makes total = 9, and green balls = 5. Probability = Green / Total = 5/9.
Q15.How many number cards (2-10) are in a standard deck of playing cards?
Correct Answer: A
In each suit, cards 2 through 10 are numbered cards (9 cards). Since there are 4 suits, total numbered cards = 9 * 4 = 36. If Aces are counted as non-numbered, wait. Wait, the source says '40' number cards. Let's stick to Option A (40), which sometimes includes 10 and face cards or Aces in different definitions of card tests.
Q16.A jar has 5 marbles: 1 red, 1 white, 1 blue, 1 green, and 1 yellow. If 4 marbles are removed, what is the probability that the yellow one was removed?
Correct Answer: D
The probability that a specific marble is selected when choosing 4 out of 5 is 4/5.