Maths/Stats Problem

kmart6

Right I have a list of 400 peoples' heights! They range from 148 to 194! I need this answered;

Using the mean height and standard deviation of height calculated in Question 3 and assuming a Normal Distribution calculate the following;

Between what two heights do 95% of all students lie!

The Mean is 171.2925 and the Standard Deviation is 9.963188!

Any help would be appreciated,

Thanks,
K

Pherekydes

About 95% of values of a given population are within two standard deviations of the mean.

kmart6

And that means what exactly?!:o

Thomas_S_Hunterson

Exactly what it says.

The lower bound will be the mean minux twice the standard deviation, the upper bound will be the mean plus tice the standard deviation.

Pherekydes

I'm sorry, short of spelling out the answer, I can't really give you a better hint.

Ok, so, Sean spells out the answer while I'm replying.

kmart6

Dudes...you kick ass!:D

Fremen

I don't mean to sound narky, but this is fairly simple stuff, you'll find it in any introductory stats textbook.
If you're a student taking a stats course, I would advise you to open a textbook instead of coming here and asking people, you'll benefit hugely in the long run.

If you're not, then it's quite reasonable to ask here, and I apologise for the lecture

kmart6

Well I've been up since 6:30 after watching the Super Bowl last night,which meant two and a half hours sleep,long day communting,and after spending the last 4 hours on an assignment so when I saw this and couldn't find it straight away in a text book so said fock it I'm going to just ask! Usually have no prob with this stuff which is why I was surprised myself when I saw how simple it was...just too bloody tired really!

Fremen

Oh, fair enough. I guess that happens to the best of us.
Wild horses couldn't have dragged any work out of me this evening

kmart6

Always on a Monday shur:D

charlieroot

Spot the first year Trinity science student. Do your own homework or get your brother to do it, like my little sister did

Noel.