In order to estimate the mean amount of time computer users spend on the internet eachmonth, how many computer users must be surveyed in order to be 95% confident that your sample mean is within 15 minutes of the populationmean? Assume that the standard deviation of the population of monthly time spent on the internet is 197 min. What is a major obstacle to getting a good estimate of the populationmean? Use technology to find the estimated minimum required sample size.

The minimum sample size required is ____ nothing computer users.

(Round to the nearest whole number)