The problem in Chapter 6, Exercise 1 should read:
Write a query to return the average weight of all touring bikes sold by Adventure Works Cycles that list for more than $2,300. Use the ProductSubCategory table to determine how you should filter these products.
The correct script would be:
-- Exercise 1 Solution
----------------------
-- (Correction from instructions... include touring bikes with list price over $2,300 rather than $2,500)
SELECT AVG(Weight)
FROM Production.Product
WHERE ProductSubcategoryID = 3 and ListPrice > 2300