Grandma Gertrude's Chocolates, a family owned business, has begun making a new line of chocolates with high levels of cacao so it can advertise its health benefits of antioxidants. The product with the highest % cacao at Grandma Gertrude's Chocolates averages 45% cacao with a standard deviation of 6%. Suppose a sample of 36 pieces of this chocolate is taken from the production line. What is the standard deviation of the sampling distribution of the sample mean?