is this a collage class?

Question

anonymous · Answer

no, it's a group study, people help out other people, sometimes people do it together so that they can get a right answer trusted by many, ask a question and see how many reply, or answer a question and get a fan or a medal

jessicawade · Answer

oh well i need some help with advanced algebra, im in highschool

jdoe0001 · Answer

post anew then

jdoe0001 · Answer

and be specific :)

jdoe0001 · Answer

you can always attach pictures or screenshots you may have, or also draw using the white-board here

jessicawade · Answer

heres my question :
find the area of the shaded region under the standard distribution

jessicawade · Answer

attachment

jessicawade · Answer

A.	

0.7611
B.	

2.5000
C.	

0.9452
D.	

0.1841

jessicawade · Answer

i dont know how to find the area

jdoe0001 · Answer

@jessicawade    try posting anew...thus if we dunno, in my case, then someone else may

jessicawade · Answer

oh ok

anonymous · Answer

@jdoe0001  can you help me in a problem plz?

jdoe0001 · Answer

@pipiansito1   post anew :)

e.mccormick · Answer

@jessicawade have a SD chart?  You usually have one somewhere in a statistics book.

jessicawade · Answer

no im homeschooled and we dont have a book lol which maks sense *cough* @e.mccormick

e.mccormick · Answer

Did they give you a chart on their site like this: http://www.mathsisfun.com/data/standard-normal-distribution-table.html

jessicawade · Answer

oh snaps no

e.mccormick · Answer

Well, they talk about it there.  You look at the z score and which column you need depends on the decimals.

Now, yours is just the forst column.  That helps.

Another thing to remember is that area is positive.  See, the score is from 0.  So you need to find the area of both the above 0 and below 0 as if they were positive values and add them to get the total are.

e.mccormick · Answer

And, from trying it, I can say that chart will get you one of those answers.

e.mccormick · Answer

Do you see .9 on the left column? That is the ROW you use for anything that starts with a z of .9.  If it was .97, you would move over to the .07 column and use that row/column intersection.  But yours is just .9, so you use the .00 column.  

Use the same method to find the other value.  Add the two values.

On that same page, "Example: Percent of Population Z Between -1 and 2" shows this same method to answer a question similar to yours.