Italian Barolo ~ Italy is famous for several types of wine. The region of Piedmont is famous for a type of wine called "Barolo". A wine salesperson wants to know the demand for Barolo wine sold at Supermarkets. He selects a random sample of wine sales from a popular supermarket and constructs a 95% confidence interval for the actual proportion of Barolo wine sold to be (0.2931, 0.4396). What is the sample proportion? Give the exact answer as a decimal.