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DEVRY MATH399 July Week 5 Latest Discussion

John Marsh
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DEVRY University MATH399 Applied Managerial Statistics Week 5 Discussion

Week 5 Discussion

Normal Distributions

Log onto
website where you can observe your service bill for the last 12 months
(electric bill, cell phone bill, water bill, etc.). If you do NOT feel
comfortable sharing this data, you can make up values.

In excel,
list the values of your bill for the last 12 months on one column.

Find the
sample mean and sample standard deviation of your data.

Pick three
bills from the last 12 months and change the values into z-scores. What does
the z-score tell you about that particular month?


what two values would be considered a normal bill? Remember, being within 2
Standard Deviations is considered normal.

Are any of
your bills in the last 12 months unusual? Very unusual?

Are there
times when you would accept an “unusual” bill? Explain.

MATH399 Applied Managerial Statistics

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