the end of the hour and the end of the lecture and suppose the pdf of X is as follows. f(x)={kx20​0≤x≤2 otherwise ​ (a) Find the value of k. (Enter your answer to three decimal places.) (b) What is the probability that the lecture ends within 1 min of the end of the hour? (Enter your answer to three decimal places.) (c) What is the probability that the lecture continues beyond the hour for between 15 and 45 sec? (Round your answer to four decimal places.) (d) What is the probability that the lecture continues for at least 45 sec beyond the end of the hour? (Round your answer to four decimal places.)