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how do you find the sample mean. The mean of this distribution is 05 and its standard deviation is approximately 03. The random variable X has a mean denoted m X and a standard deviation denoted s X.
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The mean is the average of. The mean of the data is 122465 155 3. That is if we took the mean of an infinite number of samples of size n on average their value would be the same as the population mean mu.
We will write X when the sample mean is thought of as a random variable and write x for the values that it takes.
For the example of distances you would add 44 17 522 849 71 64 486 235 which sum to 2288 miles. We will write X when the sample mean is thought of as a random variable and write x for the values that it takes. You need to get the variable for which you want to know the mean and standard deviation into the variables box on the right as per the image above. For example if the mean of our sample is 20 we can say the true mean of the population is 20 plus-or-minus 2 with 95 confidence.
