跪求高手解答GMAT数学
1.thearithmeticmeanandstandarddeviationofacertainnormaldistributionare13.5and1.5respectively.Whatvalueisexactly2standarddeviationlessthanthemean?
2.IfKisapositiveinteger,iskthesquareofaninteger?
(1)kisdivisibleby4
(2)kisdivisiblebyexactlyfourdifferentprimenumbers