A particle moves in the xy-plane according to the parametric equations 
and 
for 
.What is the average speed of the particle during the time interval 
?
Definitions:
Standard Deviation
A measure of the dispersion or variability of a set of data points, indicating how spread out the data are from their mean.
Subtract
The action or method of deducting one number or quantity from another.
Variance
A statistical measure of the dispersal or spread of a set of numbers, indicating how much the numbers vary from the average of the set.
Represent
To depict or stand in for a population or set of data in a study or analysis.
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