On top of the vegetables list are cucumber and lettuce, consisting of 96 percent water. Zucchini, radish and celery are comprised of 95 percent water. Ninety-four percent of tomato's weight is water, and green cabbage is 93 percent water.
I looked at the process sigma calculator (button in upper right below the search box) and they present a link to a forum post (http://www.isixsigma.com/forum/showmessage.asp?messageID=437) that gives information on calculating the sigma using a normsinv function.
Sigma (upper-case Ï, lower-case Ï, lower-case in word-final position Ï; Greek: ÏÎ¯Î³Î¼Î±) is the eighteenth letter of the Greek alphabet. In the system of Greek numerals, it has a value of 200. When used at the end of a word (when the word is not all caps), the final form (Ï) is used, e.g. á½Î´ÏÏÏÎµÏÏ (Odysseus); note the two sigmas in the center of the name, and the word-final sigma at the end. 1  1 History.  1.1 Etymology.