For the given probability density function, over the given interval, find the mean, the variance, and the standard deviation.f(x) = 
, [5, 14]
A. ? = 
; ?2 = 
; ? = 2.60
B. ? = 7; ?2 = 
; ? = 13.70
C. ? = 7; ?2 = 
; ? = 2.29
D. ? = 
; ?2 = 
; ? = 2.29
Answer: A
Mathematics
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Match the given equation with one of the graphs.2x2 - 48y = 24
A. 
B. 
C. 
D. 
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Write an expression, in simplified form, for the sum of the measures of the four angles.
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