There's no built in way to do this, but you can get this number by:
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Export your family tree as a CSV file.
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Open the CSV file in a spreadsheet
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Find cell G1 (it is in the top row and has the word "Deceased" in it)
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Copy and paste this formula into that cell: =COUNTIF(G2:G20000,"Y")
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That cell will now contain the number of deceased people in your family tree, assuming all the deceased people are marked as deceased.
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You can get the number of total people from the Find box at the bottom of your family tree. Subtracting will give you the living people.