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/1600 for x in [0, ?), where t is measured in days. Find the expected value and the standard deviation of this probability density function.
A. ? = 1600 days; ? = 2262.4 days
B. ? = 3200 days; ? = 2262.4 days
C. ? = 1600 days; ? = 3200 days
D. ? = 1600 days; ? = 1600 days
Answer: D
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. Start with 
Then, in each case find x2.
What will be an ideal response?
Find the value of df-1/dx at x = f(a).f(x) = x2 - 5x + 6; a = 5
A. 5
B. 
C. 
D. 
Solve the problem.The time T in seconds for a pendulum of length L feet to make one swing is given by T = 2?
. How long is a pendulum (to nearest hundredth) if it makes one swing in 1.8 seconds? Use 3.14 for ?.
A. 33.21 ft B. 3.37 ft C. 132.84 ft D. 21.15 ft
Find the probability of the following card hands from a 52-card deck. In poker, aces are either high or low. A bridge hand is made up of 13 cards.In bridge, 4 aces
A. .00059 B. .01056 C. .00264 D. .00118