Please help with d

A study discovered that Americans consumed an average of 13.4 pounds of chocolate per year. Assume that the annual chocolate consumption follows the normal distribution with a standard deviation of 3.9 pounds. Complete parts a through e below. a. What is the probability that an American will consume less than 9 pounds of chocolate next year? 0.1296 (Round to four decimal places as needed.) b. What is the probability that an American will consume more than 11 pounds of chocolate next year? 0.7308 (Round to four decimal places as needed.) c. What is the probability that an American will consume between 10 and 14 pounds of chocolate next year? 0.3675 (Round to four decimal places as needed.) d. What is the probability that an American will consume exactly 12 pounds of chocolate next year'? (Round to four decimal places as needed.)