Math Is Fun Forum

survival

Member

Registered: 2011-04-03

Posts: 655

Standard normal curve

Find percentage of area under the standard normal curve:
Between Z =0 and Z =1.2
please help soon

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Standard normal curve

Hi survival;

.38493

---

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.

survival

Member

Registered: 2011-04-03

Posts: 655

Re: Standard normal curve

Z=-1.5 and Z = -.55
thanks

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Standard normal curve

.2244

I seem to remember showing you how to do these... Do you need to see it again?

---

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.

survival

Member

Registered: 2011-04-03

Posts: 655

Re: Standard normal curve

14% of the total left of z

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Standard normal curve

Hi survival;

To 2 decimal places -.36 to 0   gives an area of .14057 or 14.06%

---

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.

survival

Member

Registered: 2011-04-03

Posts: 655

Re: Standard normal curve

Z= -1 and Z= -0.5

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Standard normal curve

.1499

Have you seen this calculator:

http://www.zscorecalculator.com/index.php

---

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.

survival

Member

Registered: 2011-04-03

Posts: 655

Re: Standard normal curve

14 % of the total area to the left of Z
Thank you

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Standard normal curve

See post #5.

---

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.

survival

Member

Registered: 2011-04-03

Posts: 655

Re: Standard normal curve

where?

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Standard normal curve

Right here, post #5, 7 up from you last one.

I am going to take a little break to eat, see you in a bit.

---

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.

survival

Member

Registered: 2011-04-03

Posts: 655

Re: Standard normal curve

I notice my calculator is not always right. And the numbers should not have to be rounded off.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Standard normal curve

What do you mean I do not understand?

---

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.

survival

Member

Registered: 2011-04-03

Posts: 655

Re: Standard normal curve

z = .75 and z = 1.2    %

survival

Member

Registered: 2011-04-03

Posts: 655

Re: Standard normal curve

Z = .75 and Z 1.2             %

survival

Member

Registered: 2011-04-03

Posts: 655

Re: Standard normal curve

oops pc won't type
find per centage of area under the standard normal curve that is shown
between z =0 and z = 0.9

survival

Member

Registered: 2011-04-03

Posts: 655

Re: Standard normal curve

hello, where did u go

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Standard normal curve

Hi;

Got called away!

.3159 is the area.

31.59%

---

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.

survival

Member

Registered: 2011-04-03

Posts: 655

Re: Standard normal curve

nice to see u back.
I have more:
Z = 0.75 and z = 1.2 Find the per cent under the standard curve

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Standard normal curve

Hi survival;

.1116 is the area. The percentage is 11.16%

---

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.

survival

Member

Registered: 2011-04-03

Posts: 655

Re: Standard normal curve

20 % of the total area is to the left of z.
Z =

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Standard normal curve

-.53 to 0 represents .2019 or 20.19% of the area under ths SNC.

More accuracy, -.526 to 0 represents .2006 or 20.06% of the area under ths SNC.

---

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.

survival

Member

Registered: 2011-04-03

Posts: 655

Re: Standard normal curve

where are you getting this info? I could have used it.

survival

Member

Registered: 2011-04-03

Posts: 655

Re: Standard normal curve

so the answer is -.526?