Find the standard deviation of the data summarized in the given frequency table.The manager of a bank recorded the amount of time each customer spent waiting in line during peak business hours one Monday. The frequency table below summarizes the results. Find the standard deviation. Round your answer to one decimal place. 
A. 5.3
B. 5.4
C. 5.1
D. 4.8
Answer: C
Mathematics
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Find the center of mass of a thin plate of constant density covering the given region.The region between the curve y = 
and the x-axis from 
to 
A. 
= 
, 
= 
ln 36
B. 
= 
, 
= 
ln 36
C. 
= 860, 
= 36 ln 36
D. 
= 
ln 36, 
= 
Mathematics
Use the order of operations agreement to simplify the given expression.
? 
+ 
? 
A. 
B. 
C. 
D. 
Mathematics
Solve.5x + 2y + z = -112x - 3y - z = 177x + y + 2z = -4
A. (-3, 0, 4) B. (3, 0, -4) C. (0, 6, -1) D. (0, -6, 1)
Mathematics
Solve the equation.-5x + 5 + 3(x + 1) = -4x + 1
A. 
B. 
C. 
D. 
Mathematics