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Distribution Chart using EXcel spreadsheet

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You are the production manager for an operation that produces circuit boards. Each board is tested at the end of the manufacturing process. Rejected boards are discarded and have no future value. For product B-17, you have kept data on the number of rejects for the past 38 weeks.

Does this approximate a normal curve?

What is the Standard Deviation (use Excel to calculate this value with the STDEV function)?

What is the approximate probability that at least 7 rejected boards will be produced next week

I have the the distribution chart already. I am unsure as to what is a normal curve and what is a standard deviation.

Attached is the chart below.

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Solution Summary

You are the production manager for an operation that produces circuit boards. Each board is tested at the end of the manufacturing process. Rejected boards are discarded and have no future value. For product B-17, you have kept data on the number of rejects for the past 38 weeks.

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