Question

1. Find the sample mean and sample standard deviation of your data.
2. What is the Z score?

	Data
1	223
2	200
3	154
4	217
5	223
6	157
7	178
8	159
9	350
10	243
11	325
12	298

3. 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?

4. Between what two values would be considered a normal bill? Remember, being within 2 Standard Deviations is considered normal.
5. Are any of your bills in the last 12 months unusual? Very unusual?
6. Are there times when you would accept an "unusual" bill? Explain.

Answer 1