Question 1103959
online calculator says and shows .8186


<a href = "http://davidmlane.com/hyperstat/z_table.html" target="_blank">http://davidmlane.com/hyperstat/z_table.html</a>


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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


<a href = "http://www.stat.ufl.edu/~athienit/Tables/Ztable.pdf" target = "_blank">http://www.stat.ufl.edu/~athienit/Tables/Ztable.pdf</a>


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my TI-84 plus says .8185946784.


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