, which is the IQ score separating the bottom 10% from the top 90%.
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max iq score below 10% is .1 from the tables the invnorm (.1)=-1.282
given thatZ=-1.82 and z = (value-mean)/standard deviation
HEnce the value = Standdev*z+mean= 15*-1.282+100=80.77 this is the answer
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