The random variable X is normally distributed. Also, it is known that P(X > 183) = 0.04. [You may find it useful to reference the z table.] a. Find the population mean if the population standard deviation = 12. (Round "z" value to 3 decimal places and final answer to 2 decimal places.) b. Find the population mean if the population standard deviation = 24. (Round "z" value to 3 decimal places and final answer to 2 decimal places.) c. Find the population standard deviation if the population mean = 168. (Round "z" value to 3 decimal places and final answer to 2 decimal places.) d. Find the population standard deviation if the population mean = 153. (Round "z" value to 3 decimal places and final answer to 2 decimal places.)