Let the mean success rate of a Poisson process be 7 successes per hour a. Find the expected number of successes in a 31 minutes period. (Round your answer to 4 decimal places.) Expected number of successes b. Find the probability of at least 2 successes in a given 31 minutes period. (Do not round intermediate calculations. Round your final answer to 4 decimal places.) Probability c. Find the expected number of successes in a one hour 6 minutes period. (Round your answer to 4 decimal places.) Expected number of successes