Find the standard deviation of the number 20, 19, 20, 19, 19, 20.
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ᴩʟᴇᴀꜱᴇ ᴍᴀʀᴋ ᴀꜱ ʙʀᴀɪɴʟɪᴇꜱᴛ ᴩʟᴇᴀꜱᴇᴇ
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