anonymous
  • anonymous
If I flip four coins what is the probability that at least two of the coins are heads?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
Please help
amistre64
  • amistre64
its the opposite of P(at most 1 is heads)
amistre64
  • amistre64
1 - P(0) - P(1)

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More answers

anonymous
  • anonymous
do you have choices
amistre64
  • amistre64
there are 16 outcomes tttt ttth ttht thtt httt ... 1 4 6 4 1 = 16 0 heads is 1 out of 16 1 head is 4 out of 16
anonymous
  • anonymous
What about at least 2 heads
amistre64
  • amistre64
at least 2 heads means that you have 2, 3, or 4 heads P(0) + P(1) + P(2) + P(3) + P(4) = 1 P(2) + P(3) + P(4) = 1 - P(0) - P(1)
amistre64
  • amistre64
since P(0) = 1/16 and P(1) = 4/16 the solution is determined
anonymous
  • anonymous
So what would the answer be written as?
amistre64
  • amistre64
im not going to do the subtraction for you ....
amistre64
  • amistre64
you can tell me what you get ... and i can verify if you did it correctly
anonymous
  • anonymous
bro your even confusing me.... amistre64
amistre64
  • amistre64
im not a mind reader, so youll have to be more detailed in what is confusing :)
anonymous
  • anonymous
nevermind .. the probability would be 50% John
amistre64
  • amistre64
the probability is not 50%; for starters, a probability is a number between 0 and 1 ... not a percentage.
amistre64
  • amistre64
and for another, 1 - P(0) - P(1) does not equal .5000 or 1/2
anonymous
  • anonymous
he asked for a probability. if you flip 4 coins and the odds of 2 of the comming out heads is 2/4 and tht equals 50% and wtf is p
anonymous
  • anonymous
its not rocket science he just wants a simple answer.. idk whats wrong with tht
amistre64
  • amistre64
\[\binom{4}{0}.5^0.5^4+\binom{4}{1}.5^1.5^3+\binom{4}{2}.5^2.5^2+\binom{4}{3}.5^3.5^1+\binom{4}{4}.5^n.4^0=1\] \[(1).5^0.5^4+(4).5^1.5^3+(6).5^2.5^2+(4).5^3.5^1+(1).5^4.5^0=1\]
amistre64
  • amistre64
P(E) is notation for "probability of an event"
amistre64
  • amistre64
the last 3 terms are 4 choose 2, 4 choose 3, and 4 choose 4 which is what we want if we are to determine "at least 2" out of 4
amistre64
  • amistre64
subtracting the first 2 terms from each side gives us the solution
anonymous
  • anonymous
your making this way more complex than it already isnt lol if you know the damn answer then tell him and quit arguing with a degenerate!
amistre64
  • amistre64
i suggest you tone down your language. and, we are not providing a free answering service, we are offering a way to learn the material.
amistre64
  • amistre64
my first attempt was to simplify it .... since that did not work i resorted to the longer, more detailed version of it all.
anonymous
  • anonymous
So the answer is .6875?
anonymous
  • anonymous
Or 11/16
amistre64
  • amistre64
11/16 is correct either way is fine, but the format is up to whoever is doing the grading.
anonymous
  • anonymous
Thanks I just forgot how to do this from the beginning of the year
amistre64
  • amistre64
you did fine :) good luck

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