Intensive care units (ICUs) generally treat the sickest patients in a hospital ICUs are often the most expensive department in a hospital because of the specialized equipment and extension training an ICU doctor or nurse. Therefore, it is important to use ICUs as efficiently an possible in a hospital. Suppose that a large-scale study of elderly ICU patients shows that the average length of stay in the C35 days Accume that this length of stay in the ICU has an exponential distribution (Round your answers to four decimal places.) (a) What is the probability that the length of stay in the 100 is one day or less? (b) What is the probability that the length of stay in the ICU is between two and theee dars (c) What is the probability that the length of stay in the ICU is more than five days?