Solve.Locate the centroid of a semicircular region.
A. 
= 
= 
= 
a
B. 
= 
= 
= 
a
C. 
= 
= 
= 
a
D. 
= 
= 
= 
a
Answer: A
Mathematics
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A PDF for a continuous random variable X is given. Use the PDF to find E(X).f(x) = 
A. 
B. 1
C. 
D. 
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= x4 + 2x3 + 2x2 - 4x - 8
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