A population has a standard deviation of 34. We take a random sample of size 30 from this population. Let Xbar be the sample mean and let Xtot be the sample sum of our sample. These are random variables. d) What is the variance of Xbar? (to three decimal places)  e) What is the standard deviation of Xbar? (to three decimal places)  f) What is the smallest sample size, n, which will make the standard deviation of Xtot at least 900?  g) What is the smallest size sample, n, which will make the variance of Xtot at least 90000

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