Anand knows from experience that if he does not review a new vocabulary word that he has learned, that he has a 70% chance of forgetting it each day. Let D be the number of days Anand goes without reviewing a word until he forgets it. Find the probability that it takes Anand 4 or more days to forget the word. You may round your answer to the nearest hundredth.

An optical inspection system is used to distinguish among different part types. the probability of a correct classification of any part is 0.92. suppose that three parts are inspected and that the classifications are independent. let the random variable x denote the number of parts that are correctly classified. determine the probability mass function of x. round your answers to four decimal places (e.g. 98.7654). x f(x) 0 1 2 3