Pulsified333
  • Pulsified333
Suppose that you flip a coin 13 times. What is the probability that you achieve at least 5 tails?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
thats a binomial probability problem
anonymous
  • anonymous
lol your math teacher must hate you
anonymous
  • anonymous
lol

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anonymous
  • anonymous
at least 5 means 5 or 6 or 7 or 8 or 9 or 10 or 11, or 12,or 13
Pulsified333
  • Pulsified333
No he just gives us insane amounts of homework while the other teachers at the university give like half of what he gives us
anonymous
  • anonymous
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
anonymous
  • anonymous
\[P(x=0)=\left(\frac{1}{2}\right)^{13}\]
anonymous
  • anonymous
naw chill just use the formula of sumation
anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
\[P(x=1)=13\left(\frac{1}{2}\right)^{13}\]
anonymous
  • anonymous
use you calculator to plug it into a summation
Pulsified333
  • Pulsified333
haven't learned that formula yet
anonymous
  • anonymous
:(
anonymous
  • anonymous
\[P(x=2)=\binom{13}{2}\left(\frac{1}{2}\right)^{13}\]
anonymous
  • anonymous
ok how about the nCr * p^r * q^(n-r) ?
Pulsified333
  • Pulsified333
yeah i know that
anonymous
  • anonymous
ok now plug it in for the values 1, 2, 3, 4, 5 and add them then subtract that sum from 1
anonymous
  • anonymous
1, 2, 3, 4, 5 being your success rate
anonymous
  • anonymous
cool?
Pulsified333
  • Pulsified333
yeah
Pulsified333
  • Pulsified333
but what does (13 2) mean?
anonymous
  • anonymous
13 tries and there are only 2 possible outcomes
Pulsified333
  • Pulsified333
oh okay
anonymous
  • anonymous
subtract this number from 1 http://www.wolframalpha.com/input/?i=%281%2B13%2B78%2B286+%2B715%29%2F2^%2813%29
anonymous
  • anonymous
lol
Pulsified333
  • Pulsified333
thanks :D

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