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September 25, 2025, 07:05:13 pm
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Author Topic: TyErd's questions  (Read 42419 times)  Share 

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TyErd

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Re: TyErd's questions
« Reply #465 on: September 17, 2010, 03:02:11 pm »
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I cant seem to get this question. Help?
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Blakhitman

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Re: TyErd's questions
« Reply #466 on: September 17, 2010, 03:35:38 pm »
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start you off...

Pr(X<a)=0.8

should be able to do it now.
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akira88

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Re: TyErd's questions
« Reply #467 on: September 17, 2010, 03:45:23 pm »
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Integrate that function between the values a and 1/2 (make sure the a is on the bottom and 1/2 at the top) where 0<a<1/2 (meant to be equal or less than signs) and make it equal 0.2.
Sorry I don't know how to use Latex :P
Hopefully the answer should be D.
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Blakhitman

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Re: TyErd's questions
« Reply #468 on: September 17, 2010, 03:52:20 pm »
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Quote from: akira88 on September 17, 2010, 03:45:23 pm
Integrate that function between the values a and 1/2 (make sure the a is on the bottom and 1/2 at the top) where 0<a<1/2 (meant to be equal or less than signs) and make it equal 0.2.
Sorry I don't know how to use Latex :P
Hopefully the answer should be D.

Lol thought domain was x>0 cause a similar question our practice exam today haha.

But yep their way is better.
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TyErd

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Re: TyErd's questions
« Reply #469 on: September 17, 2010, 04:38:25 pm »
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i keep getting stuck at
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TyErd

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Re: TyErd's questions
« Reply #470 on: September 17, 2010, 04:40:09 pm »
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i've honestly tried everything i can think off but i still cant get it
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fady_22

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Re: TyErd's questions
« Reply #471 on: September 17, 2010, 04:44:49 pm »
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Quote from: TyErd on September 17, 2010, 04:38:25 pm
i keep getting stuck at

Solve for a, and the first positive solution is your answer.
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TyErd

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Re: TyErd's questions
« Reply #472 on: September 17, 2010, 04:47:24 pm »
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i tried using the calculator but get weird answers with n8 , n9 etc in them
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fady_22

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Re: TyErd's questions
« Reply #473 on: September 17, 2010, 04:53:12 pm »
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Quote from: TyErd on September 17, 2010, 04:47:24 pm
i tried using the calculator but get weird answers with n8 , n9 etc in them

You have to specify the domain (the n8 is a parameter, you have been given a general solution) to get a numerical answer, i.e. type in |0<x<1/2 at the end.  
« Last Edit: September 17, 2010, 06:58:59 pm by fady_22 »
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TyErd

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Re: TyErd's questions
« Reply #474 on: September 17, 2010, 04:58:24 pm »
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still getting a general solution...
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akira88

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Re: TyErd's questions
« Reply #475 on: September 17, 2010, 05:10:27 pm »
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Quote from: TyErd on September 17, 2010, 04:58:24 pm
still getting a general solution...
You sure? What fady_22 said should fix the problem.
If you have a TI-89, put the | sign in (given that), and then specify the domain 0<a<1/2
So it should look like
solve( ∫ (pi*sin(2*pi*x),x,a,1/2)=0.2,a)|0≤a≤1/2

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Blakhitman

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Re: TyErd's questions
« Reply #476 on: September 17, 2010, 05:14:27 pm »
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Quote from: akira88 on September 17, 2010, 05:10:27 pm
Quote from: TyErd on September 17, 2010, 04:58:24 pm
still getting a general solution...
You sure? What fady_22 said should fix the problem.
If you have a TI-89, put the | sign in (given that), and then specify the domain 0<a<1/2
So it should look like
solve( ∫ (pi*sin(2*pi*x),x,a,1/2)=0.2,a)|0≤a≤1/2



Same with Ti-nspire
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TyErd

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Re: TyErd's questions
« Reply #477 on: September 17, 2010, 05:40:10 pm »
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okay what i typed into the calculator is: and that gives me a general solution
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Blakhitman

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Re: TyErd's questions
« Reply #478 on: September 17, 2010, 06:11:57 pm »
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Tried it myself and yes you're right.

Dunno what's wrong.
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Blakhitman

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Re: TyErd's questions
« Reply #479 on: September 17, 2010, 06:18:39 pm »
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Is the answer 0.35?
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