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).

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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

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"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

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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

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