marigirl
  • marigirl
A man writes letters to one of two newspapers: the Argus and the Beacon. If a newspaper publishes one of his letters he sends the next one to the same newspaper; if not, he tries the other newspaper next time. The probablility that the Argus published one of his letters is 0.6 whereas for the Beacon it is 0.75. If he tosses a fair coin to decide where to send his first letter, calculate the probability that the third letter is send to Argus and his fourth letter send to Beacon. Can you help me with starting the tree diagram please
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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marigirl
  • marigirl
His first letter can be sent to A (0.5) or B (0.5). Do we consider that too at the beginning of tree diagram
phi
  • phi
yes
marigirl
  • marigirl
I don't quite understand what is meant by ' If a newspaper publishes one of his letters he will send next one to same newspaper if not tries the other one next time'

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phi
  • phi
it will take me a few minutes to make sense of it.
marigirl
  • marigirl
can u check my tree diagram plz ill draw it now
marigirl
  • marigirl
|dw:1438893491483:dw|
phi
  • phi
ok. AP means A published and AP' means A does not publish if A is published, then you send the next letter (letter #2) to A if AP' then you send letter #2 to B
phi
  • phi
it is a confusing tree because we have to keep track of where we send the next letter, and whether it was published.
marigirl
  • marigirl
if AP then next letter gets sent to A . is the prob for that 1?
phi
  • phi
I am tempted to write it this way |dw:1438893877024:dw|
marigirl
  • marigirl
great, then i will add up all the possibilities of when the 3rd letter was sent to A
phi
  • phi
you have to extend this to the 4th letter, so the tree will get quite large.
marigirl
  • marigirl
thanks :)

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