We want to estimate the mean distance traveled to work by employees of a large manufacturing firm. Past studies indicate that the standard deviation of these distances is 2.0 km and that the distances...

We want to estimate the mean distance traveled to work by employees of a large manufacturing firm. Past studies indicate that the standard deviation of these distances is 2.0 km and that the distances follow a normal distribution. How many employees should be chosen at random and polled if the estimated mean distance is to be within 0.1 km of the true mean with a confidence level of 95%?