How much paint should the painter expect to use to paint a wall with an area of 256 square feet?

It depends on how thick or how thin he rolls it on.
We could calculate a definite answer if we knew how much paint
he uses for a different area ... like the information that's in the OTHER
sentence, BEFORE the part of the question that you posted.

Ifound this on google “a skewed (non-symmetric) distribution is a distribution in which there is no such mirror-imaging. a "skewed right" distribution is one in which the tail is on the right side. a "skewed left" distribution is one in which the tail is on the left side. the above histogram is for a distribution that is skewed right.” i hope this you for what your looking for