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 is a statistical symbol for the standard deviation. Six sigma, therefore, pertains to six standard deviations between the mean value of a process and the customerâs specification limit. It also denotes a set of techniques used to improve business processes and minimize product defects. Letâs explore this definition in concrete terms.