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## How do I solve this on excel? X is distributed as a Normal random variable with mean of 100 and a standard deviation of 10 (i.e X~N(100,10). You take a random sample of 30 items from X and you calculate the average of this sample. Of course, someone else could take a random sample of 30 items, calculate the average, and get a slightly different number. The sample average, then, is itself a random variable with its own mean (of 100) and standard deviation. What is the standard deviation of the sample averages?

How do I solve this on excel?

X is distributed as a Normal random variable with mean of 100 and a standard deviation of 10 (i.e X~N(100,10). You take a random sample of 30 items from X and you calculate the average of this sample. Of course, someone else could take a random sample of 30 items, calculate the average, and get a slightly different number. The sample average, then, is itself a random variable with its own mean (of 100) and standard deviation. What is the standard deviation of the sample averages?

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