According to Dana Arnold and Margaret Iversen in the book Art and Thought (2003), "the extimate is not the opposite of intimate. It is the Lacanian terms [in psychology] generated to explain those psychic phenomena that defy the inside/outside, self/other boundary and are thus both exterior and intimate at the same time. Extimite is connected with Lacan's theory of object a which is a trace in the psych of that from which the subject has been cut away, like a negative shadow. It is thus the otherside of the subject, foreign and removed yet encapsulated within the psyche's most fundamental recesses" (151). Basma El-Shimy Misr International University
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A scatter diagram will give a quick but rough extimate of the trend line - especially if there is a lot of variation about the trend. The least squares method will be more accurate.
I don't know the density of sand so I'll extimate. 1 cubic ft of water weighs 62.4 pounds. Sand weighs about 2.2 times as much as water. so 1 cft would weigh 62.4x2.2 = 137.28 lbs. I'll round to 140 1 ton of feathers is 2000 lbs, so is 1ton of sand. 2000 / 140 = 100/7 = 14.3 cubic feet.
What does mean mean
The arithmetic mean is a weighted mean where each observation is given the same weight.
the mean is an average of a set of numbers