IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Math => Topic started by: astarmathsandphysics on May 13, 2010, 03:05:32 pm

Title: Normal distribution
Post by: astarmathsandphysics on May 13, 2010, 03:05:32 pm

I drew these tables for a student yesterday to help with the normal distribution - what to do with a -z or p<0.5

Title: Re: Normal distribution
Post by: Stealth on May 14, 2010, 01:35:18 pm

Have you finished the 4 page notes on permutations and combinations?? Can you plzzzzzzzz also include when to use factorials when the nPx formula and all the other possible restrictions for permutations and combinations  ;D

Title: Re: Normal distribution
Post by: astarmathsandphysics on May 14, 2010, 02:12:40 pm

Done 3 pages. Put then up 2mite

Title: Re: Normal distribution
Post by: Stealth on May 14, 2010, 03:49:48 pm

Thanks alottt ...really i owe u a hug thanks.

Title: Re: Normal distribution
Post by: Stealth on May 14, 2010, 08:26:14 pm

Have u finished  ::)

Title: Re: Normal distribution
Post by: astarmathsandphysics on May 14, 2010, 09:09:36 pm

Yes. They will be up in about 3 hours. Have done 4 pages.

Title: Re: Normal distribution
Post by: Stealth on May 14, 2010, 09:15:34 pm

Like i said supercool and thnk u so very much for helping me out wee days b4 exams :)

Title: Re: Normal distribution
Post by: astarmathsandphysics on May 14, 2010, 09:28:50 pm

No probs. I am on a one hundred year mission to wrte revision notes for every 14-22 syllabus in the world. Maybe 100000 pages eventually

Title: Re: Normal distribution
Post by: Freaked12 on May 14, 2010, 10:26:10 pm

Quote from: astarmathsandphysics on May 14, 2010, 09:28:50 pm

No probs. I am on a one hundred year mission to wrte revision notes for every 14-22 syllabus in the world. Maybe 100000 pages eventually

God bless

Title: Re: Normal distribution
Post by: mz on May 14, 2010, 11:00:11 pm

plz paste a copy of link here when their done

Title: Re: Normal distribution
Post by: astarmathsandphysics on May 14, 2010, 11:05:28 pm

Up now near the bottom of this page

http://www.astarmathsandphysics.com/a_level_maths_notes/a_level_maths_notes_s1_menu.html

Title: Re: Normal distribution
Post by: Stealth on May 15, 2010, 08:20:20 am

Thnk you soooooo much, theyre the best notes ive seen on the topic so far

Title: Re: Normal distribution
Post by: Stealth on May 15, 2010, 09:30:11 am

Theres a flaw though!!!! the choir qs u put up...the answer to c part is actually 288 while the ur method gives 10^16 smething (288 is the answer given in Markscheme) and i am confused by the long winded calculations whereas the total marks to this part are only 3

Title: Re: Normal distribution
Post by: Stealth on May 15, 2010, 07:38:22 pm

You there Astar ....there r lots of contradictions in ur notes with the markschemes , found another one with the circle part too ???

Title: Re: Normal distribution
Post by: a2man on May 17, 2010, 09:12:02 am

Actually stealth seems to be correct and i believe its his right to point something out that is incorrect, it's a think called free speech and forms the ground for a reasoned society. Coming to my point , I too took out time to go through astar's notes. While others were good , I saw quite a few anomalies and they to coincide with those pointed out by stealth.

Secondly, from what the topic is about, I believe stealth has the right to show his agitation as his exams are just around the corner and if you feed in wrong info esp over a topic that needs reinforcement, those agitations are bound to expressed.

Title: Re: Normal distribution
Post by: a2man on May 17, 2010, 10:30:32 am

The correct answer to the circle one can be found by n!/n (According to Schaum's Outline Probability and Statistics; The same problem appears in 1st Chapter : "Basic Probability")

To the Sopranos one which came in CIE 9709/6 May june paper, the answer is 288 as it appears in MS by multiplying 4!*3!*2

Title: Re: Normal distribution
Post by: Stealth on May 18, 2010, 08:29:26 am

Finally some sane person...
@MANI u wanna 'Eff" w/ me .."Eff Off"