250 students in a math class take the final exam. The scores on the exam have an approximately normal distribution with mean ? = 75 and standard deviation ? = 10.Approximately how many students had test scores between 68.25 and 85?
A. 107
B. 85
C. 188
D. 147
E. none of these
Answer: D
Mathematics
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Multiply.-0.8 ? (-19.3)
A. 15.44 B. 20.1 C. -18.5 D. -20.1
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Find the value of d2y/dx2 at the point defined by the given value of t.x = 9 sin t, y = 9 cos t, t = 
A. 2
B. -2
C. - 
D. 
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Solve the problem.Find the center of mass of a thin triangular plate bounded by the coordinate axes and the line 
if 
.
A. 
= 
, 
= 
B. 
= 
, 
= 
C. 
= 
, 
= 
D. 
= 
, 
= 
Mathematics
Follow the principles of estimation to find an approximate value.Estimate by rounding to the nearest hundred.629 × 549
A. 300,000 B. 345,321 C. 1100 D. 345,300
Mathematics