Week Inv/Bk Demand Incom. ship Outg. ship Order placed Current cost 1 12 4 4 4 16 6 2 12 4 4 4 12 12 3 10 6 4 6 6 17 4 6 8 4 8 6 20 5 11 7 12 7 6 25.5 6 20 0 9 0 6 35.5 7 22 10 12 10 4 46.5 8 17 12 7 12 0 55 9 7 16 6 16 10 58.5 10 0 13 6 13 20 58.5 What is the ratio of the standard deviation of orders to the standard deviation of
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
| Week | Inv/Bk | Demand | Incom. ship |
Outg. ship |
Order placed |
Current cost |
| 1 | 12 | 4 | 4 | 4 | 16 | 6 |
| 2 | 12 | 4 | 4 | 4 | 12 | 12 |
| 3 | 10 | 6 | 4 | 6 | 6 | 17 |
| 4 | 6 | 8 | 4 | 8 | 6 | 20 |
| 5 | 11 | 7 | 12 | 7 | 6 | 25.5 |
| 6 | 20 | 0 | 9 | 0 | 6 | 35.5 |
| 7 | 22 | 10 | 12 | 10 | 4 | 46.5 |
| 8 | 17 | 12 | 7 | 12 | 0 | 55 |
| 9 | 7 | 16 | 6 | 16 | 10 | 58.5 |
| 10 | 0 | 13 | 6 | 13 | 20 | 58.5 |
What is the ratio of the standard deviation of orders to the standard deviation of the demand?
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