I Am Doing A Comparison Of Prices For Two Stores I Have 20 Exact Items For Each

I am doing a comparison of prices for two stores. I have 20 exact items for each store. The mean for store A is 6.53. The mean for Store B is 6.22. The standard deviation for store A is 3.75 and for store B is 4.04. Both are smaller than the mean. Why? What does it mean when it is a smaller number?

 

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