The random variable X is normally distributed. Also, it is known that P(X > 181) = 0.03. [You may find it useful to reference the z table.] a. Find the population mean if the population standard deviation = 8. (Round "z" value to 3 decimal places and final answer to 2 decimal places.) b. Find the population mean if the population standard deviation = 17. (Round "z" value to 3 decimal places and final answer to 2 decimal places.) c. Find the population standard deviation if the population mean = 159. (Round "z" value to 3 decimal places and final answer to 2 decimal places.) d. Find the population standard deviation if the population mean = 145. (Round "z" value to 3 decimal places and final answer to 2 decimal places.)