9. please help asking for 5 different answers x= o= n= Z a/2= (_,_)

QUESTION 8 Suppose the length, in words, of the essays written for a contest are normally distributed and have a known population standard deviation of 325 words and an unknown population mean. A random sample of 25 essays is taken and gives a sample mean of 1640 words. Identify the parameters needed to calculate a confidence interval at the 98% confidence level. Then find the confidence interval. 20.10 20.05 20.025 20.01 20.005 1.282 1.645 1.960 2.326 2.576 You may use a calculator or the common z values above. . Round all numbers to three decimal places, if necessary