The time in hours that a technician requires to perform preventative maintenance on an air conditioning unit has a mean time of one (1) hour and a standard deviation also of one (1) hour. your company has a contract to maintain 70 of these units in an apartment building. you must schedule technicians' time for a visti to this building. consider the 70 air conditioners as a simple random sample from all air conditioning units of this type. a. what is the samplng distribution for the mean time spent working on these air conditioning units. remember a distribution describes the shape center and spread. explain fully.