Ths table contains data characterizing the unit normal distribution. The following header notations are utilized: F(x) = the area under the curve from –? to x, R(x) = the area under the curve from x to ?, W(x) = the area under the curve between –x and x, and F(?x) = 1 ? F(x) Fundamentals of Engineering. 8th edition, 2nd Revision. National Council of Examiners for Engineering and Surveying (NCEES) -- 2001. ISBN 978-1-932613-59-9. pgs 42 & 45