Let X and Y be random variables with 
=1, 
=2, 
=3, 
=1, and 
=0.5. Find the means and variances of the following quantities.
a. X+Y
b. X–Y
c. 3X+2Y
d. 5Y – 2X
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Solve the quadratic equation and round to 2 decimal places: x2- 0.75 = 0.25x
Fill in the blank(s) with the appropriate word(s).
The four basic computer functions include ________
A) Writing, processing, printing, and remembering B) Data gathering, processing, output, and evaluation C) Input, processing, storage, and output D) Sensing, calculating, actuating, and processing
"Breakdown voltage" is the voltage at which a Zener diode will do which of these?
A) Allow reverse current to flow B) Sustain damage as a result of current overload C) Stop the flow of reverse current D) Stop the flow of either forward or reverse current
The DOE?s goal for wind-generated power is for it to produce 20 percent of our electrical power by _____
a. 2016 b. 2030 c. 2035 d. 2050