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November 01, 2025, 10:12:55 am
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Author Topic: standard deviation  (Read 1836 times)  Share 

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tolga

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standard deviation
« on: February 05, 2010, 08:00:15 pm »
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what is mean standard deviation, for eg let's say the find the percentage of students greater than 14 percent and it give us the standard deviation but not the mean how are we supposed to find the mean
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the.watchman

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Re: standard deviation
« Reply #1 on: February 05, 2010, 08:05:09 pm »
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Sorry, I'm not sure what you mean by the 'percentage of students greater than 14 percent'.
That implies 86%, but I don't think that's what you want.

For the normal distribution, the mean would be found by applying the equation
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Visionz

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Re: standard deviation
« Reply #2 on: February 05, 2010, 08:12:11 pm »
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LOL. This is further. ^^^

You can do it on your calculator, have a look at the 68-95-99.7 rule in your textbook.
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the.watchman

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Re: standard deviation
« Reply #3 on: February 05, 2010, 08:13:22 pm »
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Oops, maybe I should check the topic board name before I post :P
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superflya

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Re: standard deviation
« Reply #4 on: February 05, 2010, 08:35:29 pm »
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Quote from: the.watchman on February 05, 2010, 08:05:09 pm
Sorry, I'm not sure what you mean by the 'percentage of students greater than 14 percent'.
That implies 86%, but I don't think that's what you want.

For the normal distribution, the mean would be found by applying the equation

LOLZ watchman trying to confuse everyone :P
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the.watchman

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Re: standard deviation
« Reply #5 on: February 05, 2010, 08:39:56 pm »
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Quote from: superflya on February 05, 2010, 08:35:29 pm
Quote from: the.watchman on February 05, 2010, 08:05:09 pm
Sorry, I'm not sure what you mean by the 'percentage of students greater than 14 percent'.
That implies 86%, but I don't think that's what you want.

For the normal distribution, the mean would be found by applying the equation

LOLZ watchman trying to confuse everyone :P

Lol, I'm very sorry everyone... :(
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Remember, remember the 5th of November

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Gloamglozer

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Re: standard deviation
« Reply #6 on: February 05, 2010, 10:18:21 pm »
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Quote from: the.watchman on February 05, 2010, 08:39:56 pm
Quote from: superflya on February 05, 2010, 08:35:29 pm
Quote from: the.watchman on February 05, 2010, 08:05:09 pm
Sorry, I'm not sure what you mean by the 'percentage of students greater than 14 percent'.
That implies 86%, but I don't think that's what you want.

For the normal distribution, the mean would be found by applying the equation

LOLZ watchman trying to confuse everyone :P

Lol, I'm very sorry everyone... :(

Don't worry, in the Essentials book, they do mention the equation and explain how to use it so you're not really confusing anyone.  :)
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the.watchman

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Re: standard deviation
« Reply #7 on: February 05, 2010, 10:19:01 pm »
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Quote from: Gloamglozer on February 05, 2010, 10:18:21 pm
Quote from: the.watchman on February 05, 2010, 08:39:56 pm
Quote from: superflya on February 05, 2010, 08:35:29 pm
Quote from: the.watchman on February 05, 2010, 08:05:09 pm
Sorry, I'm not sure what you mean by the 'percentage of students greater than 14 percent'.
That implies 86%, but I don't think that's what you want.

For the normal distribution, the mean would be found by applying the equation

LOLZ watchman trying to confuse everyone :P

Lol, I'm very sorry everyone... :(

Don't worry, in the Essentials book, they do mention the equation and explain how to use it so you're not really confusing anyone.  :)

Phew, good! :D

EDIT: HOORAY!!!!!!! 500th post! :D :D :D
« Last Edit: February 05, 2010, 10:21:02 pm by the.watchman »
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Blakhitman

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Re: standard deviation
« Reply #8 on: February 06, 2010, 12:27:26 am »
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Watchman is gonna be a genius from what I have been seeing.

Just putting it out there.
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the.watchman

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Re: standard deviation
« Reply #9 on: February 06, 2010, 01:56:06 pm »
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Quote from: Blakhitman on February 06, 2010, 12:27:26 am
Watchman is gonna be a genius from what I have been seeing.

Just putting it out there.

You're too kind
I've got nothing to show yet :P
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cindyy

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Re: standard deviation
« Reply #10 on: February 17, 2010, 02:25:06 pm »
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Quote from: Blakhitman on February 06, 2010, 12:27:26 am
Watchman is gonna be a genius from what I have been seeing.

Just putting it out there.

i agree!
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the.watchman

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Re: standard deviation
« Reply #11 on: February 17, 2010, 02:27:25 pm »
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Quote from: cindyy on February 17, 2010, 02:25:06 pm
Quote from: Blakhitman on February 06, 2010, 12:27:26 am
Watchman is gonna be a genius from what I have been seeing.

Just putting it out there.

i agree!

Nah, I'll crash and burn (and take people with me! :P)
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Visionz

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Re: standard deviation
« Reply #12 on: February 17, 2010, 04:35:26 pm »
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Year 10 was the year I crashed and burned. Just sayin... Or maybe it was year 9..
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the.watchman

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Re: standard deviation
« Reply #13 on: February 17, 2010, 04:37:12 pm »
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Quote from: Visionz on February 17, 2010, 04:35:26 pm
Year 10 was the year I crashed and burned. Just sayin... Or maybe it was year 9..

Then I'm late ... or I already have ... :P
I reckon I'm gonna completely faze out of maths by about term 3 :D
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