Find the mass of the lamina that occupies the region 
and has the given density function. Round your answer to two decimal places. 
Definitions:
68-95-99.7 Rule
A statistical rule stating that for a normal distribution, approximately 68% of the data falls within one standard deviation of the mean, 95% within two standard deviations, and 99.7% within three standard deviations.
Observed Responses
Observed responses refer to the actual outcomes or reactions recorded in an experiment or survey, following exposure to certain conditions or stimuli.
Linear Regression
A statistical method for modeling the relationship between a dependent variable and one or more independent variables by fitting a linear equation.
Standard Deviation
A measure of the dispersion or spread of a set of data points relative to their mean, showing how much variation exists.
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