Let a=((11*65+13*66+15*67+17*68+19*69+21*70+23*71)/(11*64+13*65+15*66+17*67 +19*68+21*69+23*70)). If a is converted into a decimal, what is the percentile of a?
令a=((11*65+13*66+15*67+17*68+19*69+21*70+23*71)/(11*64+13*65+15*66+17*67+19*68+21*69+23*70))．若将a化成小数，则a的百分位数字是多少．
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