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Sales volume last weekend for four samples, each consisting of five car dealerships, were as follows:...

Sales volume last weekend for four samples, each consisting of five car dealerships, were as follows:

Data Point 1 2 3 4 5
Sample 1 22 34 18 27 31
Sample 2 45 28 35 46 12
Sample 3 50 37 21 33 15
Sample 4 26 41 38 26 21

What is the standard deviation of the distribution of sample means?

Please round your answer to the nearest tenth.

Note that the correct answer will be evaluated based on the full-precision result you would obtain using Excel.

Math   Statistics-And-Probability   
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