Math Is Fun Forum
You are not logged in.
- Topics: Active | Unanswered
Pages: 1
#1 2011-04-14 17:24:56
- survival
- Member
- Registered: 2011-04-03
- Posts: 655
Help!!! asap Standard normal curve
Find the percent of the total area under the standard normal curve between the following z-scores
z = - 1.4 and z = -05
Offline
#2 2011-04-14 17:39:14
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Help!!! asap Standard normal curve
Is that -5 or did you leave out a decimal?
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
#3 2011-04-14 17:50:05
- survival
- Member
- Registered: 2011-04-03
- Posts: 655
Re: Help!!! asap Standard normal curve
it is 0.5
Offline
#4 2011-04-14 17:59:04
- survival
- Member
- Registered: 2011-04-03
- Posts: 655
Re: Help!!! asap Standard normal curve
so what is the answer?
Offline
#5 2011-04-14 18:06:04
- survival
- Member
- Registered: 2011-04-03
- Posts: 655
Re: Help!!! asap Standard normal curve
please
Offline
#6 2011-04-14 18:11:10
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Help!!! asap Standard normal curve
Sorry, I was busy. Please hold on.
Area between -1.4 and .5 is .6107
Area between -1.4 and -.5 = .2278
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
#7 2011-04-14 18:17:38
- survival
- Member
- Registered: 2011-04-03
- Posts: 655
Re: Help!!! asap Standard normal curve
thank you. It asked for a percent so i just used 6.2%
Offline
#8 2011-04-14 18:23:48
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Help!!! asap Standard normal curve
Nope! It is 61%. Where did she go?
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
#9 2011-04-14 18:46:32
- survival
- Member
- Registered: 2011-04-03
- Posts: 655
Re: Help!!! asap Standard normal curve
6.1 % sorry
Offline
#10 2011-04-14 18:50:55
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Help!!! asap Standard normal curve
61% You multiply by 100. Please be careful with the decimal points. You do have a slight tendency to lost them.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
#11 2011-04-14 19:13:49
- survival
- Member
- Registered: 2011-04-03
- Posts: 655
Re: Help!!! asap Standard normal curve
thanks. Now, i have to think about the project i have to turn in later today. I have to sleep at some time.
Offline
#12 2011-04-14 19:16:45
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Help!!! asap Standard normal curve
Get some sleep right now. It is very late where you are.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
#13 2011-04-15 16:53:34
- survival
- Member
- Registered: 2011-04-03
- Posts: 655
Re: Help!!! asap Standard normal curve
Did you do all of the problem with a calculator and if so, how? I have a test coming up.
Offline
#14 2011-04-15 16:55:05
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Help!!! asap Standard normal curve
I used a computer but if you would like we can do it with a table.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
#15 2011-04-15 18:49:00
- survival
- Member
- Registered: 2011-04-03
- Posts: 655
Re: Help!!! asap Standard normal curve
it is an online test, and my brain is tired. I have about two more weeks of finals to go, then break.
I did not know you did equations online, since you are fast. Where are you located? In another country I think?
Offline
#16 2011-04-15 18:50:02
- survival
- Member
- Registered: 2011-04-03
- Posts: 655
Re: Help!!! asap Standard normal curve
What sort of other tables do you have that can help?
Offline
#17 2011-04-15 18:53:46
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Help!!! asap Standard normal curve
Same ones I have been using.
I am going to take a little break now to eat. See you later!
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
#18 2011-04-15 19:25:16
- survival
- Member
- Registered: 2011-04-03
- Posts: 655
Re: Help!!! asap Standard normal curve
See you later, too. I have to sleep. I am so so tired.
Offline
#19 2011-04-15 21:08:33
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Help!!! asap Standard normal curve
Where are you located? In another country I think?
Yes, I am in another country. It is called Las Vegas, Nevada. We do not look the same as the rest of humanity. We have 2 heads and 2 right hands. That way we can compute odds better and pick up our money quicker.
To get the area under the SNC from -1.4 to .5 using tables is easy:
Go to this chart here:
http://www.regentsprep.org/Regents/math … ZChart.htm
Go to the row marked .5 and the column marked 0.0, that box says .6915. Take .5 away from that. .6915 - .5 = .1915 That is the area under the SNC from 0 to .5. To get the area from 0 to -1.4 go to the row marked -1.4 and the column marked 0.0. That box says .0808. Minus that from .5:
.5 - .0808 = .4192 that is the area under the SNC from -1.4 to 0.
Now add the two areas, .1915 + .4192 = .6107. Multiply by 100 to get a percentage = 61.07%
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
#20 2011-04-17 17:46:14
- survival
- Member
- Registered: 2011-04-03
- Posts: 655
Re: Help!!! asap Standard normal curve
if u know how to read them, it would be. I am a bit new to this.
Offline
#21 2011-04-17 17:50:34
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Help!!! asap Standard normal curve
Well, I am hoping that after this you will allow me to teach you how. Math does not go away. It just gets harder.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
Offline
Pages: 1