Figure 19.1 
-Figure 19.1 displays changes in the size of private inventories.Based on the figure,in which month is the size of private inventories likely to have been lowest?
Definitions:
Variance
A measure of how much values in a data set differ from the mean, calculated as the average of the squared differences from the mean.
Standard Deviation
An indicator of the extent of variability or spread within a data set, showing how far from the average the values range.
Deviations
Differences from a central value, such as the mean or median, indicative of variability within a data set.
Mean
The arithmetic average of a set of numbers, calculated by adding all the numbers and dividing by the count of numbers.
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