anonymous
  • anonymous
Assume the random variable X is normally distributed with u=50 and standard deviation o=7. compute the probability. P(X>34)=? please explain how to get the answer.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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phi
  • phi
This is hard to explain here. See http://www.khanacademy.org/math/probability/statistics-inferential/normal_distribution/v/ck12-org-normal-distribution-problems--z-score to get the main idea.
phi
  • phi
to do your problem we need to first find the z-score. the video explains that part.
anonymous
  • anonymous
well from what i got from the video i think i do \[\frac{ 34-50 }{ 7 } = \frac{ -16 }{ 7 } = -2.29\]

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phi
  • phi
yes. now we need to change that into a probability. I am looking at his videos trying to find the one that explains how to do it.
anonymous
  • anonymous
well using this for - z scores i got 0.011011
phi
  • phi
yes, so you know this part! you get about 1.1% chance or 0.011
anonymous
  • anonymous
lol yah & thx!
anonymous
  • anonymous
what answer do i put? i put 0.0110 but it says i'm wrong
anonymous
  • anonymous
oh!! i think i got it
phi
  • phi
oops, I wasn't thinking. we found the area under the curve from -infinity up to 34. in other words we found Pr(x≤34) |dw:1378917733017:dw|
anonymous
  • anonymous
yah i got it now its 0.988989
phi
  • phi
1-0.011= 0.989
phi
  • phi
which means there is a very good chance that x will be bigger than 34 if you picked a value at random from the distribution.
anonymous
  • anonymous
it asks for 4 decimal place so i got 0.9890
phi
  • phi
did it work ?
anonymous
  • anonymous
yup it says it's right ^_^
phi
  • phi
excellent!

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