Provide an appropriate response.The probability distribution for the random variable X is: 
What is the expected value of X?
A. 0.62
B. 0.26
C. 0.22
D. 0.50
Answer: A
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Solve the problem.It takes you 84 seconds to walk from the first (ground) floor of a building to the fourth floor. How long will it take to walk from the first floor to the 10th floor (at the same pace, assuming that all floors have the same height)?
Fill in the blank(s) with the appropriate word(s).
Use the empirical probability formula to solve the exercise.A survey of 988 adult investors asked how often they tracked their stock portfolio. The table shows the investor responses. What is the probability that an adult investor tracks his or her portfolio daily?
A. 
B. 
C. 
D. 
Solve the problem.Use a tree diagram showing all possible results when a die is rolled twice to list the ways of getting exactly one die showing a 3.
A. (3, 1),(3, 2),(3, 3), (3, 4),(3, 5),(3, 6), (1, 3), (2, 3), (4, 3), (5, 3), (6, 3) B. (3, 1),(3, 2),(3, 4),(3, 5),(3, 6) C. (3,3) D. (3, 1),(3, 2),(3, 4),(3, 5),(3, 6), (1, 3), (2, 3), (4, 3), (5, 3), (6, 3)
Divide.54 / (-6)
A. 9 B. -9 C. -10 D. 10