Class is over! Mr. Wilder does not always let his statistics class out when the bell rings. In fact, he seems to end class according to his own “internal clock.” The random variable D describes the amount of time after the bell rings (in minutes) when Mr. Wilder dismisses the class on a randomly selected day. (A negative value of D indicates he dismissed his class before the bell rang.) The density curve that follows gives the probability distribution of D?