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The Gantt Chart is the tool that is used by project managers of small projects to summarize the tasks to be accomplished and who is responsible for what on a project.
A Gantt chart is a sort of bar chart that illustrates a project schedule, named once its popularizer, Henry Gantt (1861–1919), who designed such a chart around the years 1910–1915. Modern Gantt charts additionally show the dependency relationships between activities and thus the current schedule status. A Gantt chart may be a kind of bar chart that illustrates a project schedule.
This chart lists the tasks to be performed on the vertical axis, and time intervals on the horizontal axis. The breadth of the horizontal bars within the graph shows the length of every activity. Gantt charts illustrate the beginning and end dates of the terminal components and outline elements of a project.
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Answer:
option (A) 251 phones
Explanation:
Data provided in the question:
Average quantities of prepaid cell phones used = 1500 per week
Standard deviation, s = 145
Lead time for their own brand of prepaid cell phones, L = 3 weeks
lot size = 350 phones
Safety stock = 500 phone
Now,
The standard deviation of demand during lead time will be
= Standard deviation × 
= 145 × √3
= 251.14 ≈ 251 phones
Hence,
The correct answer is option (A) 251 phones