Answer the question regarding the probability mass function described. A spinner marked off in five equal-sized regions, numbered 1, 2, 3, 4, and 5, is spun twice. Let the random variable X be the sum of the numbers of the regions where the pointer stops, and define a probability mass function 
(a) Find f(3).(b) Find ?.
A. (a) f(3) = P(X = 3) = 
(b) ? = 3
B. (a) f(3) = P(X = 3) = 
(b) ? = 3
C. (a) f(3) = P(X = 3) = 
(b) ? = 6
D. (a) f(3) = P(X = 3) = 
(b) ? = 6
Answer: D
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A. 4x(x - 2) B. 4(x2 - 2x) C. 4x(x + 2) D. 8x(x - 2)
Set up the percent proportion, and write "unknown" for the value that is not given. Recall that the percent proportion is 
= 
. Do not try to solve for any unknowns.28% of what is 61?
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Solve the problem.An electrician has to choose different types of wire for different applications. The size of the diameter of the wire is inversely related to the gauge of the wire. The chart below shows some different gauges of wire and their approximate diameters. Use the chart to answer the question. 
What is the gauge of the wire with a diameter of 
inch?
A. 16 gauge B. 10 gauge C. 12 gauge D. 14 gauge
Find all solutions of the equation in the interval [0, 2?).2 cos
- 
= 0
A. 
, 
B. 
, 
C. 
, 
D. 
, 