Question about Casio FX-115W Plus Calculator
Usually it is represented by a small letter x with a short straight bar on top of it. Sometimes it is an x with a small caret (hat, accent circonflexe) on top of it. I do not have the layout of your calculator, but if you see on the body of the calculator a small n (the number of entries), a greek capital sigma σ or a small sigma σ with x (xσn or xσn-1) standard deviations, the xbar is not far away.
Hope it helps.
Posted on Nov 17, 2009
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Posted on Jan 02, 2017
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