can you please send the answer a little bit faster

The method of tree-ring dating gave the following years A.D. for an archaeological excavation site. Assume that the population of x values has an approximately normal distribution. 1,194 1,271 1,201 1,299 1,268 1,316 1,275 1,317 1,275 In USE SALT (a) Use a calculator with mean and standard deviation keys to find the sample mean year x and sample standard deviation s. (Round your answers to four decimal places.) = 1268.444 X x A.D. = 44.3512 yr (b) When finding an 90% confidence interval, what is the critical value for confidence level? ( Give your answer to three decimal places.) 1.860 What is the maximal marlin of error when finding a 90% confidence interval for the mean of all tree-ring dates from this archaeological site? (Round your answer to the nearest whole number.) E = N Find a 90% confidence interval for the mean of all tree-ring dates from this archaeological site. (Round your answers to the nearest whole number.) lower limit 1241 A.D. upper limit 1295 A.D