The number of units of a product sold at the local bookshop varies from day to day. For a random sample of 7 days the number of units sold on each day are as follows:
8, 7, 11, 11, 15, 9, 13
Calculate the standard deviation as a measurement of the spread/dispersion of sales volume from day to day of the product.
Note: round the answer to 2 decimal places where relevant. (E.g. 22.25, or 5.00, or 0.10).
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