The Signify is often denoted as x̄, pronounced "x bar," and in many cases in other uses when the variable isn't x, the bar notation is a common indicator of some type of the suggest. In the particular situation of your inhabitants necessarily mean, instead of using the variable x̄, https://lite.evernote.com/note/39e4ef4d-6fd2-87ba-2ee1-53bc46c741b2