Let X and Y be independent random variables with 
=2, 
=1, 
=2, and 
=3. Find the means and variances of the following quantities.
a. 3X
b. X+Y
c. X –Y
d. 2X+6Y
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El término corte en cruz significa _____.
a. que se usa sólo un cuarto del árbol b. que el madero se clasifica como madera blanda c. que el madero se corta con los anillos de crecimiento en un ángulo superior a 45 grados d. que el rollizo se corta en cuatro largos iguales antes de cortarlo en maderos
Technician A says that CR EHIs with piezo actuators respond faster to energization by the injector drivers than those with solenoid actuators. Technician B says that current CR EHIs using piezo actuators tend to be slimmer and more compact than those with solenoid actuators. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B
The motor starter is switched on and off by the motor relays that are switched on and off by the control relays
Indicate whether the statement is true or false
Technician A says that most current Class 8 trucks use power-assisted steering. Technician B says that rack and pinion steering is a recent introduction in trucks. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B