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During the evening hours of 7 P.M. until 9 P.M., the number of calls received at a customer service line can be modeled as a Poisson distribution with a mean of 3 calls per 15 minutes. The probability of no calls in a 15-minute period is 0.030. a) The mean number of calls received at the hotline between 7 P.M. and 9 P.M. on a given night is: b) The standard deviation is: c) The probability of getting zero calls between 7:30 P.M. and 8:00 P.M. is: (Hint: there are two ways to solve this problem.) Edit Format Table T2V