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gabe
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09-14-2006, 08:53 PM
Post subject: need help with probability stuff NSFW Lemon Party link
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#1 (permalink)
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Moderator
Join Date: Dec 2004
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i have a bunch of work due in my probability class due tomorrow. i havent been to class all week. also, ive never had a probability class before.
the assignment is mostly related to the normal distribution. the first question is something like: 'flip a coin 400 times, if H is the number of heads, find the normal approximation to P(190 < H < 200)'
help me get started.
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cobere
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Flush
Join Date: Oct 2005
Location: Fort Collins
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You would think, asking a bunch of poker players, that you'd be inundated with replies. Its been way too long since my Discrete Math class where i did this stuff.
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On moving up, properly rolled:
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Originally Posted by drmcboy
You don't know if you're J-Fish or A Fish until you try.
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bigred
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PROFESSIONAL TROLL
Join Date: Sep 2004
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Still got that add drop form?
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LOL OPERATIONS
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gabe
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Moderator
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aww cmon guys
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thenonsequitur
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Full House
Join Date: Nov 2004
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Posts: 637
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Does this help?
http://onlinestatbook.com/chapter6/normal_approx.html
{NSFW - Xianti}
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Pelion
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09-15-2006, 12:14 AM
Post subject: Re: need help with probability stuff
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#6 (permalink)
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4-of-a-Kind
Join Date: Sep 2005
Posts: 3,206
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Quote:
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Originally Posted by gabe
i have a bunch of work due in my probability class due tomorrow. i havent been to class all week. also, ive never had a probability class before.
the assignment is mostly related to the normal distribution. the first question is something like: 'flip a coin 400 times, if H is the number of heads, find the normal approximation to P(190 < H < 200)'
help me get started.
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Ok. I dont know what a normal approximation means, and its been a long time since ive done this but id do this ===>
First you gotta standardise the thing. You give each of your numbers a Z score.
Z score is the number of standard deviations from the mean your number is.
Tossing a coin 400 times you expect the mean number of heads to be 200 so from each value you take 200.
you now have
between -10 and 0.
Now you divide by the standard deviation.
The standard deviation in a binomial problem is given by
sqrt(N*p*(1-p))
where N is the number of trials
p is the probability of a success (50%)
so in this case the varience (standard deviation squared) is
N*p*(1-p) = 400*0.5*0.5 = 100
so the standard deviation is 10
so your standardised results should be between
-1 and 0 standard deviations of the mean.
Somewhere or other you should have a table that tells you the percentage of area of a normal distribution curve that lies between 0 and z.
If not then this one will do (http://www.statsoft.com/textbook/sttable.html).
It says that 0.0398 of the area lies between 0 and 1 (or 0 and -1). In other words the probability P(190 < H < 200) = 0.0398.
As I said before its been a while since ive done this so if it turns out to be bollocks then...well.... meh.
I think its right though. If you need anymore explaining ill be awake a little while yet.
Goodluck
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gabe: Ive dropped almost 100k in the past 35 days.
bigspenda73: But how much did you win?
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Pelion
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4-of-a-Kind
Join Date: Sep 2005
Posts: 3,206
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Quote:
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Originally Posted by thenonsequitur
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you are my hero.
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gabe: Ive dropped almost 100k in the past 35 days.
bigspenda73: But how much did you win?
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Miffed22001
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Straight Flush
Join Date: Jun 2005
Location: Marry Me Cheryl!!!
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i never found this question on my english finals.
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gabe
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Moderator
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pelion, thanks. i owe you a favor, let me know when you need one.
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a500lbgorilla
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JESUS TAKE THE KEYBOARD
Join Date: Sep 2004
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going to class is both annoying and terrible!
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Smithers, use the amnesia ray.
You mean the revolver, sir?
Precisely.
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Irisheyes
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4-of-a-Kind
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Push the flop.
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Irisheyes
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4-of-a-Kind
Join Date: Jun 2005
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Quote:
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Originally Posted by Irisheyes
Push the flop.
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Hahah funny one Irish.
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arkana
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Full House
Join Date: Mar 2005
Posts: 1,109
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Quote:
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Originally Posted by thenonsequitur
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Although i find this pretty hilarious, some of us are at work and can get into serious trouble clicking on a link like that.
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Pelion
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4-of-a-Kind
Join Date: Sep 2005
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Quote:
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Originally Posted by arkana
Quote:
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Originally Posted by thenonsequitur
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Although i find this pretty hilarious, some of us are at work and can get into serious trouble clicking on a link like that. |
Good point I forgot about that. This thread needs a Giant NSFW lable
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gabe: Ive dropped almost 100k in the past 35 days.
bigspenda73: But how much did you win?
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thenonsequitur
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Full House
Join Date: Nov 2004
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Posts: 637
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I'd like to apologize for my post. I didn't mean to get anyone in trouble, and I hope I didn't.
I know how much employers hate seeing their employees studying probability theory when they should be working.
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givememyleg
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WHO YA GONNA CALL?!??
Administrator
Join Date: Nov 2005
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Quote:
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Originally Posted by thenonsequitur
I know how much employers hate seeing their employees studying probability theory when they should be working.
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Yeah that's why I was fired from my last job.
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Get your own badge! Click profile at the top and FTR Badge from the left nav.
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bode
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Straight Flush
Join Date: May 2006
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Quote:
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Originally Posted by thenonsequitur
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so im at work, and we were talking about probabilities earlier in the day. i see this thread and read gabes question and pelions response, so i decide to look at this link to see what this was all about. obv. to my surprise, this has nothing to do with probabililty, but more with geriatrics smoking pole. while i found this trickery very funny, my boss, who happened to be walking behind my desk, found it quite offensive.
for the short story, he calls me into his office and tells me to explain myself. so i did. truthfully. he found this very hard to beleive, and quite honestly, i cant blame him. he gives me the preverbial tongue lashing, and i go about my work. then about 5 minutes ago, he calls me in again, and tells me he "doesnt require my services anymore."
So i just want to say, a big FUCK YOU for posting this and getting me fired.
and yes, i would like to strangle you.
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Quote:
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eeevees are not monies yet...they are like baby monies.
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a500lbgorilla
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JESUS TAKE THE KEYBOARD
Join Date: Sep 2004
Location: This room is a good place to be
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trying to figure out if Bode-ist is lying.
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Smithers, use the amnesia ray.
You mean the revolver, sir?
Precisely.
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thenonsequitur
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Full House
Join Date: Nov 2004
Location: Location: Location
Posts: 637
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I think it's a dramatization to prove I point. I get it, and I'll be more careful in the future.
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Renton
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Straight Flush
Join Date: Jan 2006
Location: Atlanta, GA, USA
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Quote:
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Originally Posted by Bode-ist
Quote:
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Originally Posted by thenonsequitur
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owned |
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Warpe
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Moderator
Join Date: Sep 2005
Location: Canuckistan
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Quote:
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Originally Posted by Bode-ist
for the short story, he calls me into his office and tells me to explain myself. so i did. truthfully. he found this very hard to believe, and quite honestly, i cant blame him. he licks his lips with his tongue and winks at me, and i go about my work. then about 5 minutes ago, he calls me in again, and tells me he'd "like me to stay late to provide him with some special...um...services."
So i just want to say, a big THANK YOU for posting this and getting me a raise.
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fyp
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bode
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Straight Flush
Join Date: May 2006
Location: slow motion
Posts: 4,270
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ok, obviously im not that great of a liar, or story teller for that matter. Lukie, maybe some lessons please.
bad attempt at fucking with you guys. ill try harder next time.
and btw, nice FYP warpe, it made me el oh el
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Quote:
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eeevees are not monies yet...they are like baby monies.
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Lukie
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4-of-a-Kind
Join Date: Jul 2005
Location: back with a vengeance
Posts: 3,307
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Quote:
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Originally Posted by Bode-ist
ok, obviously im not that great of a liar, or story teller for that matter. Lukie, maybe some lessons please.
bad attempt at fucking with you guys. ill try harder next time.
and btw, nice FYP warpe, it made me el oh el
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I charge $1,000 an hour for storytelling lessons, dude. However, things are in high demand now so you better get in quick before I have to raise my rates!
By the way, the more relevant question for gabe is this:
How much expectation have you passed up trying to figure all this goofy shit out?
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gabe
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Moderator
Join Date: Dec 2004
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probably 2kish
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Galapogos
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4-of-a-Kind
Join Date: Jun 2005
Location: The Loser's Lounge
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I didn't know Pelion was that smart. Not a knock at him or anything. Just didn't strike me as a university guy for some reason.. it's hard to make this point without it sounding like I'm making fun of the guy. This is one of those posts I should bother completing yet watch as I submit it anyway...
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Quote:
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Originally Posted by sauce123
I don't get why you insist on stacking off with like jack high all the time.
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euphoricism
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4-of-a-Kind
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It should be well assumed that reading ANY post in the community forum while at work/school is a very, very bad idea.
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bigred
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PROFESSIONAL TROLL
Join Date: Sep 2004
Location: Nest of Douchebags
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Quote:
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Originally Posted by euphoricism
It should be well assumed that reading ANY post in the community forum is a very, very bad idea.
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FYP
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