He's speaking of the point average and you're speaking of the range average.
Yes and he knows the uslessness of point average in IQ. IQ is a range scoring. If you have an IQ of 115 that means that at the 97% confidence level using the Stanford Binet or the Weschler, your IQ has a plus or minus variation of up to 5 point...ie range of 110 to 120.
That is how IQs are discussed.