Assume that the variable under consideration has a density c

Assume that the variable under consideration has a density curve. The area under the density curve that lies to the right of 18 is 0.321.

a. What percentage of all possible observations of the variable exceed 18?

b. What percentage of all possible observations of the variable are at most 18?

Solution

a)

Percentage of all possible observations = 0.321 * 100 = 32.1 % Answer

b)

Percentage of all possible observations = (1-0.321) * 100 = 67.9 % Answer