The compressor in a refrigeration system ____.

A. raises the boiling point of the refrigerant
B. pumps the refrigerant throughout the system
C. both a and b
D. none of the above


Answer: B

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If only organic farming is used in the future, there will not be enough organic

material to fertilize all the crops planted.

Indicate whether the statement is true or false.

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A plant with seeds that have only one cotyledon or seed half is called a ____________________

Fill in the blank(s) with correct word

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An alternative to the lognormal distribution for modeling highly skewed populations is the Pareto distribution with parameters ? and r. The probability density function is



The parameters ? and r may be any positive numbers. Let Xbe a random variable with this distribution.
a. Find the cumulative distribution function of X.
b. Assume r > 1. Find .
c. Assume r > 2. Find .
d. Show that if r?1. does not exist.
e. Show that if r?2, does not exist.

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The subsequent problems deal with the circuit belowIf A=1, B=1, and C=1, what is X?

A. 0 B. uncertain C. 1

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