Refer to Exercise 19.
a. Compute the conditional mass function 
(y | 0.06).
b. Compute the conditional mass function (x|100).
c. Compute the conditional expectation E(Y | X=0.06).
d. Compute the conditional expectation E(X | Y=100).
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Based on the latest industry standards; must the oil be changed in a hermetic compressor on a close-coupled reach-in unit when retrofitting R12 with R401A?
a. Yes, you must always change from mineral oil to alkylbenzene on a retrofit. b. No, because it has been found that the oil will actually return to the compressor. c. It depends on what refrigerant you are using to retrofit the unit.
The most common storage cycle is
A) weekly. B) seasonal. C) monthly. D) 24 hours.
To reset a tripped circuit breaker, the technician should:
A) Reinstall the breaker in the electric panel. B) First turn the breaker off, and then back on. C) Move the breaker switch to the on position. D) Use a wireless breaker tool to reboot the breaker.
This sign indicates (yellow diamond shape with a cross in the middle):
a. A side road b. A cross road c. A church zone ahead