with parameter =1.7. Answer the following questions. a. Determine the probability that the number of Type 1 calls made from this motel during a period of 1 hour will be exactly four The probability that exactly four Type 1 calls are made is (Do not round until the final answer. Then round to four decimal places as needed.) b. Determine the probability that the number of Type 1 calls made from this motel during a period of 1 hour will be at most three The probability that at most three Type 1 calls are made is (Do not round until the final answer. Then round to four decimal places as needed.) c. Determine the probability that the number of Type 1 calls made from this motel during a period of 1 hour will be at least three. (Hint Use the complementation rule.) The probability that at least three Type 1 calls are made is (Do not round until the final answer. Then round to four decimal places as needed.) d. Find the mean of the random variable X = e. Find the standard deviation of the random variable X. = (Round to three decimal places as needed.)