Use spherical coordinates to find the mass of the sphere 
with the given density. The density at any point is proportional to the distance of the point from the z-axis.
Definitions:
Population
The entire set of individuals or items of interest for a given study from which samples can be drawn for statistical analysis.
Grouped Data
Data that is organized into intervals or groups for the purpose of analysis.
Individual Data Values
These are the specific observations or measurements collected in a study or analysis.
Descriptive Statistics
Statistical methods that summarize and organize characteristics of data sets, such as mean, median, mode, and range.
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