Which statement is true for a normal distribution? Why not the others? a. The shape of the PDF is always symmetric regardless of  and . b. The shape of the CDF resembles a bell-shaped curve. c. When...

Which statement is true for a normal distribution? Why not the others?

a. The shape of the PDF is always symmetric regardless of  and .

b. The shape of the CDF resembles a bell-shaped curve.

c. When no tables are available, areas may be found by a simple formula.