For a continuous random variable X, P(28 ≤ X ≤ 68) = 0.20 and P(X > 68) = 0.11. Calculate the following probabilities. (Leave no cells blank - be certain to enter "0" wherever required. Round your answers to 2 decimal places.) a. P(X < 68) b. P(X < 28) c. P(X = 68) The arrival time of an elevator in a 12-story dormitory is equally likely at any time range during the next 5.8 minutes. a. Calculate the expected arrival time. (Round your answer to 2 decimal place.) Expected arrival time b. What is the probability that an elevator arrives in less than 3.9 minutes? (Round intermediate calculations to 4 decimal places and final answer to 3 decimal places.) Probability c. What is the probability that the wait for an elevator is more than 3.9 minutes? (Round intermediate calculations to 4 decimal places and final answer to 3 decimal places.) Probability