The following shows the number of job losses and gains (in thousands) between 2008 and 2009 for a sample of seven cities. 
a.Compute the mean.
b.Determine the mode.
c.Determine the median.
d.Determine the standard deviation.
Definitions:
Not Excludable
A characteristic of certain goods where it is not feasible to prevent individuals from consuming the good, such as public parks.
Not Rival
Refers to a good's characteristic where one person's consumption does not reduce the availability of the good for consumption by others.
Common Resources
Natural or man-made resources that are not owned by anyone, are available for use by more than one person, and can be depleted.
Public Good
A product that one individual can consume without reducing its availability to another individual and from which no one is excluded.
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