The Central Company manufactures a certain specialty item once a month in a batch production run. The number of items produced in each run varies from month to month as demand fluctuates. The company is interested in the relationship between the size of the production run (x) and the number of hours of labor (y) required for the run. The company has collected the following data for the ten most recent runs. Number of items: 40 30 70 90 50 60 70 40 80 70 Labor (hours): 81 60 137 180 99 117 140 74 159 143 (a) Find a point estimate for the number of hours of labor required, on average, when 60 units are produced. (Round your ans