Question

8 the community favored bui IIU Chosen at random, a) find the expected num park, and b) find the (Round your answers to three decimal places.) d building a dog park in their probability that between 18 and 23 of them would favor building the dog park neighbothood. If 35 citizens f citizens who would be in favor of building the dog 9) A new phone system was installed last year to help reduce the expense of personal calls that were being made by employees. Before the new system was installed, the amount being spent on personal calls followed a normal distribution with an average of $715 per month and a standard deviation of $60 per month. a) Determine the z-score for the $720 spent on personal calls in the first month after the new system was installed, and b) identify the expense that would be unsually high if the new system had no effect on reducing the expense of personal calls.

Answer 1

a) Z score = (720-715)/60 = 0.0833

b) This is not unusually high because z score is between -2 and 2