, which is the IQ score separating the bottom 10% from the top 90%.
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corresponding iq. y is normally distributed, E(y)=100, σ(y) = 15.
p10 is the 10th percentile, the value that left 10% of the population below, or
P(y<p10) = 0.1
From the normal distribution table, P(Z<z)=0.9 when z=1.282, then P(Z>-z) = 0.1
p10 = E(y) - 1.282 σ(y) = 80.77
hence the iq =80.77
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