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Pulsified333

  • one year ago

Suppose that you flip a coin 13 times. What is the probability that you achieve at least 5 tails?

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  1. anonymous
    • one year ago
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    thats a binomial probability problem

  2. anonymous
    • one year ago
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    lol your math teacher must hate you

  3. anonymous
    • one year ago
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    lol

  4. anonymous
    • one year ago
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    at least 5 means 5 or 6 or 7 or 8 or 9 or 10 or 11, or 12,or 13

  5. Pulsified333
    • one year ago
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    No he just gives us insane amounts of homework while the other teachers at the university give like half of what he gives us

  6. anonymous
    • one year ago
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    you can compute the probability you get 0,1,2,3,4 and subtract that total from 1 it is still going to be a pain

  7. anonymous
    • one year ago
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    \[P(x=0)=\left(\frac{1}{2}\right)^{13}\]

  8. anonymous
    • one year ago
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    naw chill just use the formula of sumation

  9. anonymous
    • one year ago
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  10. anonymous
    • one year ago
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    \[P(x=1)=13\left(\frac{1}{2}\right)^{13}\]

  11. anonymous
    • one year ago
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    use you calculator to plug it into a summation

  12. Pulsified333
    • one year ago
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    haven't learned that formula yet

  13. anonymous
    • one year ago
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    :(

  14. anonymous
    • one year ago
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    \[P(x=2)=\binom{13}{2}\left(\frac{1}{2}\right)^{13}\]

  15. anonymous
    • one year ago
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    ok how about the nCr * p^r * q^(n-r) ?

  16. Pulsified333
    • one year ago
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    yeah i know that

  17. anonymous
    • one year ago
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    ok now plug it in for the values 1, 2, 3, 4, 5 and add them then subtract that sum from 1

  18. anonymous
    • one year ago
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    1, 2, 3, 4, 5 being your success rate

  19. anonymous
    • one year ago
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    cool?

  20. Pulsified333
    • one year ago
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    yeah

  21. Pulsified333
    • one year ago
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    but what does (13 2) mean?

  22. anonymous
    • one year ago
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    13 tries and there are only 2 possible outcomes

  23. Pulsified333
    • one year ago
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    oh okay

  24. anonymous
    • one year ago
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    subtract this number from 1 http://www.wolframalpha.com/input/?i=%281%2B13%2B78%2B286+%2B715%29%2F2^%2813%29

  25. anonymous
    • one year ago
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    lol

  26. Pulsified333
    • one year ago
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    thanks :D

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