A random sample of size 36 is selected from a population whose mean is 60 and standard deviation is 6. Calculate the probabillity that:

59 ≤ X ≤ 61

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- Jan 30th 2010, 08:38 PMMitchellA random sample of size 36 is selected...?
A random sample of size 36 is selected from a population whose mean is 60 and standard deviation is 6. Calculate the probabillity that:

59 ≤ X ≤ 61 - Jan 31st 2010, 12:00 AMmr fantastic
I assume X is the random variable 'mean of the sample'. Read this: Sampling distribution - Wikipedia, the free encyclopedia

- Jan 31st 2010, 10:14 AMMitchell
Yeah it is. I meant to put x-bar but it showed up as just X for some reason. But, I'm still not sure what I'm supposed to do here. Do I just find the standard error?

- Feb 1st 2010, 01:01 AMmr fantastic