E maths - probability

• bonkysleuth

  16 Jan 09, 22:24

  The probabilities that Alif, Kannan and Caili will pass an art examination are 4/5, 5/7, and 2/3 respectively. Find the probability that

   

  (a) at least 1 of them will pass the art examination

  (b) Only Alif will pass the art examination

• SBS n SMRT

  16 Jan 09, 22:26

  1(a) Take the lesser of the probability

  1 (b) 8/105

  Correct me if i am wrong. TQ

• charlize

  16 Jan 09, 22:28

  Actually this question is a bit odd logically.  How do you quantify artistic ability in probabilities?

   

  My bad.

   

  A little sidetrack here.

• SBS n SMRT

  16 Jan 09, 22:29

  Originally posted by charlize:

  Actually this question is a bit odd logically.  How do you quantify artistic ability in probabilities?

   

  My bad.

   

  A little sidetrack here.

  Just treat as any other qns....maths qns sometimes odd odd one.....

• charlize

  16 Jan 09, 22:32

  Originally posted by SBS n SMRT:

  Just treat as any other qns....maths qns sometimes odd odd one.....

  Maybe this question is actually asking you to think logically.

   

  The correct answer is the one where the student asks the teacher what I just asked.

• SBS n SMRT

  16 Jan 09, 22:34

  Originally posted by charlize:

  Maybe this question is actually asking you to think logically.

   

  The correct answer is the one where the student asks the teacher what I just asked.

  Trick qns maybe

• charlize

  16 Jan 09, 22:35

  Remember Men In Black?

   

  When Will Smith was being tested on which monsters he will shoot, he chose the little girl who was holding the Higher level Physics textbook and not the other big fucking monstrous creatures.

   

  That's logical thinking.

   

   

• maurizio13

  16 Jan 09, 22:43

   

  charlize is expert in probability and statistics.

   

  probability is common sense reduced to calculation -- laplace

   

   

• charlize

  16 Jan 09, 22:45

  Originally posted by maurizio13:

   

  charlize is expert in probability and statistics.

   

  probability is common sense reduced to calculation -- laplace

   

   

  Nonsense.

   

  I failed maths in school.

• maurizio13

  16 Jan 09, 22:45

  Originally posted by charlize:

  Actually this question is a bit odd logically.  How do you quantify artistic ability in probabilities?

   

  My bad.

   

  A little sidetrack here.

   

  Bertrand's Paradox?

   

   

• charlize

  16 Jan 09, 22:48

  Originally posted by maurizio13:

   

  Bertrand's Paradox?

   

   

  Argh.

   

  Stop confusing me.

• bonkysleuth

  16 Jan 09, 22:50

  Originally posted by SBS n SMRT:

  1(a) Take the lesser of the probability

  1 (b) 8/105

  Correct me if i am wrong. TQ

  
  I think the answer for (a) is 103/105. But I do not know how to get that. You are right for part (b)

• FirePig

  16 Jan 09, 23:08

  Originally posted by bonkysleuth:

  The probabilities that Alif, Kannan and Caili will pass an art examination are 4/5, 5/7, and 2/3 respectively. Find the probability that

   

  (a) at least 1 of them will pass the art examination

  (b) Only Alif will pass the art examination

  
  P(all fail) = 1/5 x 2/7 x 1/3 = 2/105

  P(at least one pass) = 1 - 2/105 = 103/105

• wee_ws

  17 Jan 09, 08:03

  Hi,

    To learn the concept of probability completely, it is necessary to know some key points:

    1. Addition principle of mutually exclusive events.
    For example, probability that Kannan OR Caili will pass.

    2. Multiplication principle of a series of events.
    For example, probability that Kanna AND Caili will fail.

    3. Probability of complementary event, P(A') = 1 - P(A).
    For example, P(failure event) = 1 - P(passing event).

    4. Mutually exclusive events A, B: A intersect B = empty set and P(A intersect B) = 0.
    For example, Kanna cannot pass and fail at the same time.

    5. Independent events A, B: P(A intersect B) = P(A) . P(B).
    For example, the event that Alif will pass and the event that Caili will fail are independent.

    Thanks!

  Cheers,
  Wen Shih

• limywv

  18 Jan 09, 14:59