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/1800 for x in [0, ?), where t is measured in days. Find the expected value and the standard deviation of this probability density function.
A. ? = 3600 days; ? = 2545.2 days
B. ? = 1800 days; ? = 3600 days
C. ? = 1800 days; ? = 2545.2 days
D. ? = 1800 days; ? = 1800 days
Answer: D
Mathematics
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A. 15a2 + 5a - 5 B. 15a2 - 5a + 5 C. -15a2 - 5a - 5 D. -15a2 + 5a - 5
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Find the difference.Subtract 36.5847 from 82.4258.
A. 45.7411 B. 45.8311 C. 46.8411 D. 45.8411
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Solve the problem.The mathematical model 
represents the cost in dollars a company has in manufacturing x items during a month. How many items were produced if costs reached $140,000?
A. 139,800 items B. 600 items C. 500 items D. 800 items
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Graph the function as a solid line or curve and its inverse as a dashed line or curve on the same axes.f(x) = 
x - 2
A. 
B. 
C. 
D. 
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