Question 6 1.5 pts Please note the numbers may change from one question to another. A publisher sells books to Barnes & Noble who then sells the books to its customers. The expected demand over the next two months will be normally distributed, with a mean of 30,000 and a standard deviation of 8,000. Barnes & Noble places a single order with the publisher for delivery at the beginning of the two-month period and discounts any unsold books at the end of two months. A plan under discussion is for the publisher to refund Barnes & Noble certain amount per book that does not sell during the two-month period. Because Barnes & Noble shares the point-of-sales data with the publisher, the publisher does not require Barnes & Noble to return all unsold books for verification purpose. Thus, Barnes & Noble can still discount and sell any unsold books at the end of two month period. Suppose Barnes & Noble orders 31,680 books from the publisher, how many customers on average will be turned away because of shortage