SOLUTION: What percentage of the data under a normal curve would indicated between z = -1 and z = 2 ?

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Question 1103959: What percentage of the data under a normal curve would indicated between z = -1 and z = 2 ?
Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
online calculator says and shows .8186

http://davidmlane.com/hyperstat/z_table.html

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table says z = -1 has area to the left of it of .1587.
table says z = 2 has area to the left of it of .9772.

subtract .1587 from .9772 and the area between z = -1 and 2 shows as .8185

http://www.stat.ufl.edu/~athienit/Tables/Ztable.pdf

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my TI-84 plus says .8185946784.

the calculators are more accurate than the table, so go with .8186.