In order to sell a piece of land an owner must indicate the boundary of the property and acreage of the land. to model the scenario, create a composite shape that represents the land. explain how to find the length of the boundary and the acreage of the property with the composite shape. i need this. it would be greatly appreciated

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.