3. Credit card companies will often call cardholders if the pattern of use indicates that the card might have been stolen. Let's say that you charge an average of $280 a month on your credit card, with a standard deviation of $75. The credit card company will call you anytime your purchases for the month exceed the 98th percentile. What is the dollar amount beyond which you'll get a call from your credit card company? (That is, what dollar amount is at the 98th percentile for your purchase history?)