anonymous
  • anonymous
A mutiple choice test consists 8 questions with each question having 2 possible answers. how many different ways are there to mark the answers?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
no more answers
anonymous
  • anonymous
just one more!
anonymous
  • anonymous
Use the product rule.

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More answers

anonymous
  • anonymous
and it would come up to?
anonymous
  • anonymous
you tell me?
anonymous
  • anonymous
she just wants answers
anonymous
  • anonymous
You have 8 question, and you can answer each question 2 ways, how many total ways can you answer?
anonymous
  • anonymous
16
anonymous
  • anonymous
Nope
anonymous
  • anonymous
its 8 questions and u can answer it 2 different ways which it doubles
anonymous
  • anonymous
If it were just 2 questions with 2 ways to answer, how may ways would there be to fill the test?
anonymous
  • anonymous
2
anonymous
  • anonymous
2^2
anonymous
  • anonymous
Actually that's a bad example. If there were 3 questions with 2 ways to answer each how many ways
anonymous
  • anonymous
I'm not asking you cantor ;p
anonymous
  • anonymous
ok :)
anonymous
  • anonymous
in the same way but just with 3
anonymous
  • anonymous
Lets say it's a true false test with 3 questions. I can answer True, True, True False, True, True True, False, True False, False, True True, True, False False, True, False True, False, False False, False, False Right?
anonymous
  • anonymous
Yeah I know that
anonymous
  • anonymous
So how many is that?
anonymous
  • anonymous
25
anonymous
  • anonymous
Really? Cuase I only count 8 different ways I can do the test.
anonymous
  • anonymous
Err Cause rather.
anonymous
  • anonymous
theres 8 ways but all toghether theres 25 if u count the true false's
anonymous
  • anonymous
No. There are 8 different possible ways to complete the test.
anonymous
  • anonymous
25 ????????????????
anonymous
  • anonymous
So for your original question if you have 8 questions, how many possible ways can you complete the test?
anonymous
  • anonymous
should i ask ?
anonymous
  • anonymous
if u count them all toghether u get 25 thats how so stop u guys are suppose to help not be mean
anonymous
  • anonymous
sorry i was talking to polpak
anonymous
  • anonymous
w.e bye someone else will help me
anonymous
  • anonymous
Giving you the answer doesn't help you
anonymous
  • anonymous
well when it's done and outta the way I will not have to look back at it so..
anonymous
  • anonymous
except when it's time to take the test, or when something new is taught that uses this to solve, etc.
anonymous
  • anonymous
Everything builds on everything else
anonymous
  • anonymous
ur helping everyone else and giving them answeers?
anonymous
  • anonymous
pol, she added up all of them, she cant count either , there are 24 in that list
anonymous
  • anonymous
Yeah
anonymous
  • anonymous
there's 25
anonymous
  • anonymous
no theres 24
anonymous
  • anonymous
There are 8 lines, with 3 words on each line.
anonymous
  • anonymous
This is one of those things you got someone to tell you and didn't look back about I can see.
anonymous
  • anonymous
i didnt even think of that,
anonymous
  • anonymous
\[8\times 3 \ne 25\]
anonymous
  • anonymous
right
anonymous
  • anonymous
pol, so your integration seems redundant
anonymous
  • anonymous
hrm?
anonymous
  • anonymous
its 2 not 3
anonymous
  • anonymous
You talking about your u-sub question? please ask over there.
anonymous
  • anonymous
well, 8*2 is certainly not 25.
anonymous
  • anonymous
sure
anonymous
  • anonymous
you mean 8 *3
anonymous
  • anonymous
its 16
anonymous
  • anonymous
she cant count and doesnt reason well.
anonymous
  • anonymous
I do mean 8*3, but she claimed it was 2, not 3.
anonymous
  • anonymous
the problem states 3 not 2
anonymous
  • anonymous
wait, i guess theres some subtley here. let me see
anonymous
  • anonymous
2 not 3
anonymous
  • anonymous
Erg. Ok look chika. I enumerated the possible outcomes for a test with 3 questions where each question had 2 answers.
anonymous
  • anonymous
ok each of those lines is ONE possibility for the test to be solved
anonymous
  • anonymous
Each line in my post was a way you could complete the whole test. Not one question.
anonymous
  • anonymous
so you wrote out the entire sample space
anonymous
  • anonymous
Try something more simple. If you have two true or false questions how many ways can you answer them?
anonymous
  • anonymous
I didn't want to try to write out the sample space for 8 questions because a) that would have given her the answer, and b) I didn't want to write 256 lines.
anonymous
  • anonymous
the other way is to use multiplication rule for the first question there are 2 ways, second question there are 2 ways to answer, etc, so the total ways is 2 x 2 x 2 ...
anonymous
  • anonymous
kind of like a tree diagram
anonymous
  • anonymous
so you can enumerate the entire space, as you did pol for your simpler example. or you can use product rule rather than enumerate 256 cases
anonymous
  • anonymous
o wait
anonymous
  • anonymous
I got it
anonymous
  • anonymous
http://www.khanacademy.org/v/probability--part-2?p=Probability
anonymous
  • anonymous
chika, how did you get 25 !!!
anonymous
  • anonymous
i got the answer
anonymous
  • anonymous
pol, it is redundant because you already have cos z dz in the numerator
anonymous
  • anonymous
du = cos z dz, and you already have cos z dz in the numerator

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