Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

pakinam

  • 3 years ago

I throw darts repeatedly. Assume that on each single throw, my chance of hitting the bullseye is 10%, independently of all other throws. I decide to throw until I have hit the bullseye 3 times. What is the chance that I throw exactly 30 times?

  • This Question is Closed
  1. reemii
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    you have this info: 30 throws, last throw is a BE (bullseye). P(BE)=0.1. But you don't know where the other two BE's are. So it's like that: (29 hits with 2BE's) and 1BE. Does this help?

  2. pakinam
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ahh ok

  3. reemii
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    you have to use a combintation "C(n,k)" factor in the computation of the probability of (29 throws with 2 BE's), then multiply by P(1BE).

  4. sarah10
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    is the ans 40.6

  5. reemii
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    No, the answer must be a number of [0,1]. but it should be \(P(\text{2 BE's in 29 throws})\times P(\text{1 BE}) = \binom{29}{2}0.1^{2}\,0.9^{27} \times 0.1\). I got 0.02360879322323428... as anwer.

  6. sarah10
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    is it the right ans ..... actually in frst attempt i got the the wrong ans

  7. reemii
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    it's right.

  8. sarah10
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thank you soooo much 4 helping me

  9. reemii
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    yw

  10. pakinam
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    0.0236 is wrong

  11. reemii
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    what's your answer ?

  12. pakinam
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i got wrong when i entered this answer

  13. Khlara
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @pakinam i gt it correct

  14. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy