Post by: khalil on August 14, 2009, 03:36:51 pm
The weight of cats is evenly distributed. It is known that 10% of cats weigh more than 1.8kg, and 15%of cats weigh less than 1.35kg. Find the mean and s.d of this distribution
Post by: kamil9876 on August 14, 2009, 05:15:44 pm
90% of cats wiegh weight less than 1.8kg. Hence find the z value that corresponds to 90%, call this
15% of cats wiegh less than 1.35. Find the z value that corresponts to 15%, call this
Notice taht once you find
Post by: khalil on August 14, 2009, 05:21:48 pm
Post by: kamil9876 on August 14, 2009, 06:02:49 pm
I don't know how you kids are taught to do it but basically it's solving for a z1 and z2 such that Pr(z<z1)=0.9. Pr(z<z1)=0.15. (There's a table that can convert this for you but I'm guessing that with fancy calculators you can do this much simpler).
I hope someone here can help on this one because I forgot how to use the technology as I only concern myself with pure mathematics these days.
Post by: khalil on August 14, 2009, 07:07:00 pm
Post by: kamil9876 on August 14, 2009, 07:39:00 pm
kids? how old are you?
Not much older, was just referring to how year 12 feels like ages away and a completely different world(especially when it comes to using graphics calculator and trivial information).
Post by: TrueTears on August 14, 2009, 07:43:19 pm
As for the question, Z1 and Z2 like kamil said are determined by the %, you need to equate the values you have on your normal distribution curve with the values that produce the same area from the STANDARD normal distribution curve. The inverse normal function in stats list editor can do this.
Post by: khalil on August 14, 2009, 09:16:08 pm
kamil9876 is a grown up man and is already supporting a family of 5.
As for the question, Z1 and Z2 like kamil said are determined by the %, you need to equate the values you have on your normal distribution curve with the values that produce the same area from the STANDARD normal distribution curve. The inverse normal function in stats list editor can do this.
WOH WOH. wait a second. Before kamil changed his pic, wasnt it a girl before? I remember vividly. It was of these two girls and had caption 'me n my friend'
Post by: TonyHem on August 14, 2009, 09:20:01 pm
kamil9876 is a grown up man and is already supporting a family of 5.
As for the question, Z1 and Z2 like kamil said are determined by the %, you need to equate the values you have on your normal distribution curve with the values that produce the same area from the STANDARD normal distribution curve. The inverse normal function in stats list editor can do this.
WOW WOW. wait a second. Before kamil changed his pic, wasnt it a girl before? I remember vividly. It was of these two girls and had caption 'me n my friend'
rofl
Post by: khalil on August 14, 2009, 09:20:22 pm
I probably sound like an investigator, and I couldnt care less if you were a boy or girl, but i'm just intrigued
Post by: kurrymuncher on August 14, 2009, 09:23:16 pm
Post by: TrueTears on August 14, 2009, 09:24:11 pm
Post by: khalil on August 14, 2009, 09:40:36 pm
Post by: kamil9876 on August 14, 2009, 09:50:02 pm
Girls don't say dude :)
Maybe in certain kinds of movies they don't, but exposure to them in reality may reveal otherwise.
Post by: kurrymuncher on August 14, 2009, 09:52:38 pm
Girls don't say dude :)
Maybe in certain kinds of movies they don't, but exposure to them in reality may reveal otherwise.
quote of the century!!!!!!!!!!!
Post by: Over9000 on August 14, 2009, 09:57:24 pm
I.e |TT=girl| = |my skills at Italian|
Post by: xXNovaxX on August 15, 2009, 06:42:17 pm
Dude ofcourse I'm a girl, after all I do go to Scotch, an all girl's schoolROFL. check-mate