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  • Question
  • A number is selected at random from the set {1, 2, 3, ........, 50}. The probability that it is a prime, is


  • Options
  • A. 0.1
  • B. 0.2
  • C. 0.3
  • D. 0.3

  • Correct Answer
  • 0.3 

    Explanation

    n(s) = 50
    Prime numbers are = 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47
    ? n(E) = 15
    ? p(E) = 15/50 = 3/10 = 0.3


  • Probability problems


    Search Results


    • 1. 
      Let E be the set of all integers with 1 at their unit places. The probability that a number chosen from {2, 3, 4, ............, 50} is an element of E, is?

    • Options
    • A. 5/49
    • B. 4/49
    • C. 3/49
    • D. 2/49
    • Discuss
    • 2. 
      If three unbiased coins are tossed simultaneously, then the probability of exactly two heads, is

    • Options
    • A. 1/8
    • B. 2/8
    • C. 3/8
    • D. 4/8
    • Discuss
    • 3. 
      A card is drawn from a well-shuffled pack of cards. The probability of getting a queen of club or a king of heart is?

    • Options
    • A. 1/52
    • B. 1/26
    • C. 1/13
    • D. 1/39
    • Discuss
    • 4. 
      What is the probability that a card drawn at random from a pack of 52 cards is either a king or a spade?

    • Options
    • A. 17/52
    • B. 4/13
    • C. 3/13
    • D. 13/52
    • Discuss
    • 5. 
      Four whole number taken at random are multiplied together. The chance that the last digit in the product is 1, 3, 7, or 9 is?

    • Options
    • A. 16/625
    • B. 1/210
    • C. 8/125
    • D. 4/25
    • Discuss
    • 6. 
      A committee of 3 members is to be selected to be selected out of 3 man and 2 women . What is the probability that the committee has at least one women?

    • Options
    • A. 1/10
    • B. 9/20
    • C. 9/10
    • D. 1/20
    • Discuss
    • 7. 
      An urn contains 3 red and 4 green marbles. If three marbles are picked at random, what is the probability that two are green and one is red?

    • Options
    • A. 3/7
    • B. 18/35
    • C. 5/14
    • D. 4/21
    • Discuss
    • 8. 
      If two marbles are picked at random, what is the probability that both marbles are red?

    • Options
    • A. 1/6
    • B. 1/3
    • C. 2/15
    • D. None of the above
    • Discuss
    • 9. 
      If three marbles are picked at random, what is the probability that two are blue and one is yellow?

    • Options
    • A. 3/91
    • B. 1/5
    • C. 18/455
    • D. 7/15
    • Discuss
    • 10. 
      If four marbles are picked at random, what is the probability that at least one is blue?

    • Options
    • A. 4/15
    • B. 69/91
    • C. 11/15
    • D. 22/91
    • Discuss


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