Solve the problem.The time between major earthquakes in a particular region of the Mediterranean is a random variable with probability density function f(x) = 
e-x/1700 for x in [0, ?), where t is measured in days. Find the expected value and the standard deviation of this probability density function.
A. ? = 1700 days; ? = 1700 days
B. ? = 1700 days; ? = 2403.8 days
C. ? = 1700 days; ? = 3400 days
D. ? = 3400 days; ? = 2403.8 days
Answer: A
Mathematics
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A. 
B. 
C. 
D. 
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Evaluate the expression using the given values.
?x = 3, y = 10
A. 
B. 
C. 
D. 
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Solve for x.|0.9x + 0.7| ? 1
A. -0.889 ? x ? -0.667 B. -0.333 ? x ? 1.889 C. -1.889 ? x ? 0.333 D. 0.667 ? x ? 0.889
Mathematics
Evaluate the polynomial for the given values of the variables.Evaluate xy3- y2 + 4xy + 8 for x = 2 and y = -3.
A. -61 B. 29 C. -13 D. -79
Mathematics