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Ashley Products produces cast bronze valves for use in offshore oil platforms. Currently, Ashley produces 1600 valves per day. The 20 workers at...

Hello I am trying to check my answers to make sure I am understanding this correctly, if someone could please show me the steps for these problems in case I made any errors, I would appreciate it so much. Thank you. I have attached the practice problems.
1. Ashley Products produces cast bronze valves for use in offshore oil platforms. Currently, Ashley produces 1600 valves per day. The 20 workers at Ashley work from 7 a.m. until 4 p.m., with 30 minutes off for lunch and a 15 minute break during the morning work session and another at the afternoon work session. Ashley is in a competitive industry, and needs to increase productivity to stay competitive. They feel that a 20 percent increase is needed. Ashley's management believes that the 20 percent increase will not be possible without a change in working conditions, so they change work hours. The new schedule calls on workers to work from 7:30 a.m. until 4:30 p.m., during which workers can take one hour off at any time of their choosing. Obviously, the number of paid hours is the same as before, but production increases, perhaps because workers are given a bit more control over their workday. After this change, valve production increased to 1800 units per day. a. Calculate labor productivity for the initial situation b. Calculate labor productivity for the hypothetical 20 percent increase c. What is the productivity after the change in work rules? d. Write a short paragraph analyzing these results. 2. A network consists of the following list. Times are given in weeks. a. Draw the AON network diagram. b. Calculate the expected duration and variance of each activity. c. Calculate the expected duration and variance of the critical path. d. Calculate the probability that the project will be completed in less than 28 weeks. 3. Ten samples of size four were taken from a process, and their weights measured. The sample averages and sample ranges are in the following table. Construct and plot an x-bar and R-chart using this data. Based on your graph, is the process in control?
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1. Ashley Products produces cast bronze valves for use in offshore oil platforms. Currently, Ashley
produces 1600 valves per day. The 20 workers at Ashley work from 7 a.m. until 4 p.m., with 30...

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