Find the mean and standard deviation of the specified probability density function.f(x) = 4 for [2.25, 2.50]
A. ? = 2.375, ? = 0.072
B. ? = 2.500, ? = 0.069
C. ? = 2.375, ? = 0.144
D. ? = 2.500, ? = 0.070
Answer: A
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A. 
B. 
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D. 