I keep getting part d incorrect and I am not sure what I am doing wrong. Can you please explain? Thank you.

Support requests arrive at a software company at the rate of 1 every 30 minutes. Assume that the requests arrive as events in a Poisson process. a. What is the expected number of requests in an hour? Give an exact answer. y b. What is the probability that the number of requests in an hour is between 3 and 5 inclusive? Give your answer to four decimal places. .3068 y c. What is the expected number of requests in a 10 hour work day? Give an exact answer. y d. What is the probability that the number of requests in a 10 hour work day is between 28 and 32 inclusive? Give your answer to four decimal places. :] x e. What is the standard deviation of the number of requests in a 10 hour work day? Give your answer to four decimal places. 4.4721 y