Maintain 4-decimal places.

The average gold content [rem an are sample in 36 dierent locations is found to be 1.5 grams per ton. a. Find the 95% and 99% confidence intervals for the mean gold content in that area. Assume that the population variance is 0.09. b. How large a sample is required if we want to he 95% condent that our estimate of sample mean is off by less than 0.05}? 4:. Compute a 95% confidence interval for the standard deviation of the gold content