1.An assembly line consists of 158 tasks grouped into 9 workstations. The sum of all task times is 11.2 minutes. The cycle time of the line is 5.0 minutes. The efficiency of this line is approximately ( )

2. Given an actual demand of 109, a prior forecast value of 104, and an alpha of 0.06, the exponential smoothing forecast for the next period would be ( ).

3.The trend equation of a time series is 83 + 8.7 X. What is your forecast for period 3 （ ）。

4. A foundry produces circular utility access hatches (manhole covers). If 93 covers are produced in a 25-hour shift, the productivity of the line is ( )。

5.Gibson Valves produces cast bronze valves on an assembly line, currently producing 94 valves per shift. If production increases to 101 valves per shift, labor productivity will increase by （ ).