I need help solving this solution.

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 90% confident that your sample mean is within 11 minutes of the populationmean? Assume that the standard deviation of the population of monthly time spent on the internet is 192 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 _ computer users.

(Round up to the nearest wholenumber.)

What is a major obstacle to getting a good estimate of the populationmean?

A.

It is difficult to precisely measure the amount of time spent on theinternet, invalidating some data values.

B.

The data does not provide information on what the computer users did while on the internet.

C.

There may not be 825 computer users to survey.

D.

There are no obstacles to getting a good esitmate of the population mean.