anonymous
  • anonymous
i need help with a probability question
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
I can probably help you
anonymous
  • anonymous
can you post ?
anonymous
  • anonymous
oh your typing it. sry didnt see.

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anonymous
  • anonymous
my question is a test consists of 20 tru/false question to pass a student must answer 18 corectly .. if a student guesses on each question, what is the probability that the student will pass the test ?
anonymous
  • anonymous
I think 40%
anonymous
  • anonymous
Very close to zero, give me a minute to get the exact answer
anonymous
  • anonymous
It is definitely not 40%. Much lower
anonymous
  • anonymous
can you tell me like how to get the answer
anonymous
  • anonymous
it would help me alot
anonymous
  • anonymous
probably. I totally forgot this subject.
anonymous
  • anonymous
So...try getting the probability of one correct answer. True or false. That is 50%
anonymous
  • anonymous
If you guess on a tru/false, thats 50 percent for each answer.
anonymous
  • anonymous
so you use that and 20 get your percentage then subtract 2 I think...
anonymous
  • anonymous
Now try two answers correct. He has to guess 50% correctly twice. To answer two correct questions he has to get 50% twice
anonymous
  • anonymous
To answer 18 correct he's have to be some kind of superhero
anonymous
  • anonymous
so it will be like .50*.50 ?
anonymous
  • anonymous
Dude this is really hard to think right now i'm totally stoned out of my mind
anonymous
  • anonymous
.50*.50 18 times ?
anonymous
  • anonymous
maybe its like .50 times 18
anonymous
  • anonymous
maybe its like .5^18
anonymous
  • anonymous
OH NO NOW I REMEMBER
anonymous
  • anonymous
what you have to do it find the probability of him NOT getting 18. And subtract that from 100%
anonymous
  • anonymous
So in order to not get 18 correct he has to get three incorrect am i right?
anonymous
  • anonymous
yea
anonymous
  • anonymous
how do you find the probability of getting three incorrect?
anonymous
  • anonymous
do you know any good way to get blood out of my keyboard? Its gotten to the point where its just nasty
anonymous
  • anonymous
? what does that have 2 wid anething ?
anonymous
  • anonymous
dude i don't know i'm just trying to help you maybe you could help me too
anonymous
  • anonymous
get alcohol pads probably
anonymous
  • anonymous
that actually sounds like a good idea actually has this worked for you in the past?
anonymous
  • anonymous
dude just like find the prob. of getting three wrong then subtract. its very easy
anonymous
  • anonymous
R u talkin bout my errors?

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