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<prosody rate="slow">r equals,<break time="250ms"/> open parenthesis,<break time="200ms"/> <emphasis>one over n minus one</emphasis>,<break time="200ms"/> times the sum from i equals one to n,<break time="200ms"/> of open parenthesis capital X sub i minus capital X bar close parenthesis,<break time="200ms"/> times open parenthesis capital Y sub i minus capital Y bar close parenthesis,<break time="200ms"/> close parenthesis,<break time="250ms"/> all divided by<break time="200ms"/> <emphasis>s sub capital X</emphasis> times <emphasis>s sub capital Y</emphasis>.</prosody>