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Which statement is true for a normal distribution Why not

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.

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.

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