Probability – Exercise – 1

31. A die is tossed twice. Getting a number greater than 4 is considered a success. Then the variance of the probability distribution of the number of successes is :

(a) 2/9
(b) 4/9
(c) 1/27
(d) none of these

Answer
Answer : (b)
Explanation
Explanation : No answer description available for this question. Let us discuss.
Discuss
Discuss : Write your answer. Click here.

32. Three groups of children contain respectively 3 girls & 1 boy,2 girls & 2 boys, 1 girl & 3 boys. One child is selected at random from each group. The chance that three selected consisting of 1 girl & 2 boys, is :

(a) 9/32
(b) 3/32
(c) 13/32
(d) none of these

Answer
Answer : (c)
Explanation
Explanation : No answer description available for this question. Let us discuss.
Discuss
Discuss : Write your answer. Click here.

33. A bag contains 3 white, 3 black and 2 red balls. One by one three balls are drawn without replacing them. The probability that the third ball is red, is :

(a) 1/2
(b) 1/3
(c) 2/3
(d) 1/4

Answer
Answer : (d)
Explanation
Explanation : No answer description available for this question. Let us discuss.
Discuss
Discuss : Write your answer. Click here.

34. The probability that a man can hit a target is 3/4 . He tries 5 times. The probability that he will hit the target atleast three times, is :

(a) 291/364
(b) 371/464
(c) 471/502
(d) 459/512

Answer
Answer : (d)
Explanation
Explanation : No answer description available for this question. Let us discuss.
Discuss
Discuss : Write your answer. Click here.

35. Three of the six vertices of a regular hexagon are chosen at random. The probability that the triangle with these 3 vertices is equilateral, is equal to :

(a) 1/2
(b) 1/5
(c) 1/10
(d) 1/20

Answer
Answer : (c)
Explanation
Explanation : No answer description available for this question. Let us discuss.
Discuss
Discuss : Write your answer. Click here.

Related Posts

  • Probability - 36Probability » Exercise - 136. A bag contains 3 red, 4 white and 5 blue balls. All balls are different. Two balls are drawn at random. The probability that they are of different colour, is : (a) 47/66 (b) 10/33 (c) 5/22 (d) none of these
    Tags: balls, probability, random, engineering, mathematics
  • Probability - 1Probability » Exercise - 1 1. Two balls are drawn at random with replacement from a box containing 10 black and 8 red balls. Find the probability that both balls are red ? (a) 8/81 (b) 16/81 (c) 20/81 (d) 40/81
    Tags: probability, balls, random, engineering, mathematics
  • Probability - 25Probability » Exercise - 125. A bag A contains 2 white & 3 red balls & bag B contains 4 white & 5 red balls. One ball is drawn at random from a randomly chosen bag and is found to be red. The probability that it was drawn from bag B was : (a) 5/14 (b) 5/16 (c) 5/18 (d) 25/52
    Tags: probability, balls, random, engineering, mathematics
  • Probability - 6Probability » Exercise - 16. A single letter is selected at random from the word “PROBABILITY”. The probability that the selected letter is a vowel is : (a) 2/11 (b) 3/11 (c) 4/11 (d) 0
    Tags: probability, random, engineering, mathematics
  • Probability - 30Probability » Exercise - 130. From the word “POSSESSIVE”, a letter is chosen at random. The probability of it to be S is : (a) 3/10 (b) 4/10 (c) 3/6 (d) 4/6
    Tags: probability, random, engineering, mathematics