问题标题：
gre数学题请教Inanormaldistribution,68%ofthescoresliewithinonestandarddeviationofthemean.IftheSATscoresofallthehighschooljuniorsinCenterCityfollowedanormaldistributionwithameanof500andastandarddeviation
问题描述：
gre数学题请教
Inanormaldistribution,68%ofthescoresliewithinonestandarddeviationofthemean.IftheSATscoresofallthehighschooljuniorsinCenterCityfollowedanormaldistributionwithameanof500andastandarddeviationof100,abdif10,200studentsscoredbetween400and500,approximatedlyhowmanystudentsscoredabove600?
崔艳秋回答：
Mean=500SD=100
68%withinoneSD,即中位400-600分的人占68%(32%=400-500,32%=500-600),16%在400下，16%在600上
条件都出来了~
总人数:10200/32%=31875，600以上:31875*16%=5100
或直接
10200/2=5100
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