(b) When Vera Wang was the design director of Ralph Lauren Women's Wear, she was surprised to find that wedding dresses cost an average of $4,000. So, she opened her own business - Vera Wang Bridal House - and sells designer-label wedding dresses for an average retail price of $3,800.

(i) Assume that the price of Vera Wang's designer-label wedding dresses is normally distributed with a standard deviation of $500. What is the probability that a randomly selected wedding dress costs more than $4,500?