In each of Exercises, assume that the variable under consideration has a density curve. Note that the answers required here may be only approximately correct. Given that 28.4% of all possible...

In each of Exercises, assume that the variable under consideration has a density curve. Note that the answers required here may be only approximately correct.

Given that 28.4% of all possible observations of the variable are less than 11, determine the area under the density curve that lies to the

a. left of 11.
b. right of 11.