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Tool "Mean" we can use just in Spreadsheet View. With tool we can calculate the average value of the cells.
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We can use them that we first select the cell in which we want write a result.
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Then choose the tool "Mean".
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Select cells for which we want calculate a mean.
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The result will be occur in cell which we select at the first.
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We can calculate the mean of several columns simultaneously.

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Select a columen and then choose the tool.
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The mean of each column will be inserted under each column.
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We can also calculate mean for elements in row. 
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Select the cells.
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Hold Shift and then choose the tool.
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Mean of each row will be inserted behind each row.
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