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October 27, 2025, 03:30:28 pm
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Author Topic: dcc help me thread  (Read 31473 times)  Share 

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Flaming_Arrow

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Re: dcc help me thread
« Reply #165 on: August 25, 2008, 08:33:17 pm »
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Quote from: ell on August 25, 2008, 08:28:56 pm
Quote from: droodles on August 25, 2008, 08:18:50 pm
since that asshat dcc is away in QLD, i need someone to fill in for her.

A fair coin is tossed 50 times. If X is the number of heads observed, find:



Code: [Select]
binomcdf(50,0.5,10)won't work

Why not? Answer should be approx. 0.00001193, or 1.193066584 x 10-5

yep that should be the answer
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Flaming_Arrow

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Re: dcc help me thread
« Reply #166 on: August 25, 2008, 08:35:08 pm »
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Quote from: droodles on August 25, 2008, 08:34:35 pm
well it does work but this punk slut ti-84 won't show me what i want

good work ell

ti-89 > all
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Collin Li

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Re: dcc help me thread
« Reply #167 on: August 25, 2008, 10:43:05 pm »
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Quote from: droodles on August 25, 2008, 08:34:35 pm
well it does work but this punk slut ti-84 won't show me what i want

good work ell

Have you set your calculator to show only 4 decimal places or something silly like that?
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Glockmeister

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Re: dcc help me thread
« Reply #168 on: August 25, 2008, 11:07:11 pm »
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I would check the answer on my calculator, but some bastard's stolen my calculator so I can't check it myself. Umm... there should be two commas and three numbers. Check if you have that first.

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Re: dcc help me thread
« Reply #169 on: August 27, 2008, 07:53:14 pm »
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 5
  just a guess, k
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Glockmeister

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Re: dcc help me thread
« Reply #170 on: August 27, 2008, 08:08:58 pm »
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Quote from: droodles on August 27, 2008, 07:50:39 pm
my calculator shows something like


Rex is shooting at a target. His probability of hitting the target is 0.6. What is the minimum
number of shots needed for the probability of Rex hitting the target exactly five times to be
more than 25%?

i summon mao in attack mode

This sounds like a calculator question... and my calculator has been stolen so... I'll try remembering the steps.

Let X = Hitting a target




Therefore 

We want

So basically you need to put the Probability Function into the calculator and then find the lowest n-value which is over 0.25.

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[22:07] <robbo> i luv u Glockmeister

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Mao

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Re: dcc help me thread
« Reply #171 on: August 27, 2008, 08:34:13 pm »
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binomial: p=0.6, n=n, X=5



so, you would put that into the calculator [yes, calculator] in the y editor:

Code: [Select]
y1=x*(x-1)*(x-2)*(x-3)*(x-4)/(5*4*3*2*1)*(0.6)^5*(0.4)^(x-5)
now go into "table" (make sure you have checked in "tblset" the step-size is 1 and it starts at 5), and scroll until y1 is sufficiently large enough =]
« Last Edit: August 27, 2008, 08:37:21 pm by Mao »
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Glockmeister

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Re: dcc help me thread
« Reply #172 on: August 27, 2008, 09:41:14 pm »
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Hmm.. I thought you could put the combinatorial thing directly to the y editor... can't check as I don't have a calculator.
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Re: dcc help me thread
« Reply #173 on: August 27, 2008, 10:00:16 pm »
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not sure about TI-84... they can't exactly handle algebra very well :P
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ell

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Re: dcc help me thread
« Reply #174 on: August 27, 2008, 10:42:19 pm »
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yeah you can just type in the ! straight into the y-editor (this is on my TI-83, so it should definitely work on anything newer :P)
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Mao

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Re: dcc help me thread
« Reply #175 on: August 27, 2008, 10:49:31 pm »
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hehe

so it'll be

Code: [Select]
y1=x!/((x-5)!*5!)*0.6^5*0.4^(x-5)
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Flaming_Arrow

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Re: dcc help me thread
« Reply #176 on: August 28, 2008, 07:07:49 pm »
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help

find y:




i got up to



duno what to do from here
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Collin Li

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Re: dcc help me thread
« Reply #177 on: August 28, 2008, 07:10:13 pm »
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Hence:





« Last Edit: August 28, 2008, 07:12:04 pm by coblin »
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Flaming_Arrow

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Re: dcc help me thread
« Reply #178 on: August 28, 2008, 07:11:53 pm »
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ah im so stupid :(

ty coblin
« Last Edit: August 28, 2008, 07:13:54 pm by chath »
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Collin Li

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Re: dcc help me thread
« Reply #179 on: August 28, 2008, 07:15:32 pm »
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You're not stupid! :)
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