An electric utility has placed special meters on 10 houses in a subdivision that measures the energy consumed (demand) at each hour of the day. The company is interested in the energy demand at one specific hour—the hour at which the system experiences the peak consumption. The data from these 10 meters are as follows (in KW): 23.1, 15.6, 17.4, 20.1, 19.8, 26.4, 25.1, 20.5, 21.9, and 28.7. If μ is the true mean peak demand for the 10 houses in this group of houses having the special meters, estimate μ. Now suppose that the utility wants to estimate the demand at the peak hour for all 5000 houses in this subdivision. Let θ be this quantity. Estimate θ using the data given. Estimate the proportion of houses in the subdivision that demand at least 20 KW at the hour of system peak.