Solve the problem.The annual rainfall in Maine is a random variable with probability density function defined by
for x in 
Find the probability of rainfall greater than one standard deviation above the mean.
A. 0.159
B. 0.188
C. 0.086
D. 0.346
Answer: B
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Find the numerical value of the expression for the given value.
, x = -2
A. - 4
B. 
C. 4
D. - 
Solve the problem.The length and width of a rectangle must have a sum of 40 feet. Find the dimensions of the rectangle whose area is as large as possible.
A. length 19 ft; width 21 ft
B. length 20 ft; width 20 ft
C. length 20 ft; width 60 ft
D. length 
ft; width 
ft
Solve the problem.The position of a weight attached to a spring is s(t) = -8 cos 20?t inches after t seconds. What is the maximum height that the weight reaches above the equilibrium position and when does it first reach the maximum height?
A. The maximum height of 16 inches is first reached after 10 seconds. B. The maximum height of 16 inches is first reached after 5 seconds. C. The maximum height of 8 inches is first reached after 0.05 seconds. D. The maximum height of 8 inches is first reached after 10 seconds.
Find the product and simplify.
? 
A. 
B. 
C. 
D. 