You don't have to give a thorough explanation. But something simple accompanied with the answer works fine. The assignment is due tonight I'd just like simple clarification. Most likely my teacher will go over the answers so you don't have to give a long explanation but I would like to know what I'm doing as I complete the assignment.

QUESTION 40 People with type O-negative blood are universal donors whose blood can safely be given to anyone. Only 7.2% of the population has O-negative blood. A mobile blood center is visited by 20 donors in the afternoon. Let X denote the number of universal donors among them. What is the mean of X? Answer to 2 decimal places. QUESTION 41 People with type O-negative blood are universal donors whose blood can safely be given to anyone. Only 7.2% of the population has O-negative blood. A mobile blood center is visited by 20 donors in the afternoon. Let X denote the number of universal donors among them. What is the standard deviation of X? Answer to 3 decimal places. QUESTION 42 Patients are randomly selected and the number of distinct species belonging to the Spirochaete phylum (responsible for illnesses such as Lyme disease and syphylis) are recorded. Let X count the number of distinct species found. It is speculated that X follows a Poisson distribution with a mean of 0.25. What is the probability of observing exactly two distinct species? Answer to 3 decimal places. QUESTION 43 Patients are randomly selected and the number of distinct species belonging to the Spirochaete phylum (responsible for illnesses such as Lyme disease and syphylis) are recorded. Let X count the number of distinct species found. It is speculated that X follows a Poisson distribution with a mean of 0.25. What is the probability of observing less than 3 distinct species? Answer to 3 decimal places. QUESTION 44 Patients are randomly selected and the number of distinct species belonging to the Spirochaete phylum (responsible for illnesses such as Lyme disease and syphylis) are recorded. Let X count the number of distinct species found. It is speculated that X follows a Poisson distribution with a mean of 0.25. What is the probability of observing a nonzero number of distinct species? Answer to 3 decimal places. QUESTION 45 On weekend nights, a large urban hospital has an average of 4.8 emergency arrivals per hour. Let X be the number of arrivals per hour on a weekend night at this hospital. Assume that successive arrivals are random and independent. What is the probability of observing exactly one emergency arrival? Answer to 3 decimal places