Compute the variance
Find E(x) where X is the outcome when one rolls a six-sided balanced die.Find the mgf of X. Also, using the mgf of X, compute the variance of X.
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Refrigerant 134a enters an insulated throttling valve at 140 lbf/in2 and 80°F. The refrigerant exits the valve at 50 lbf/in2. Determine the exit temperature and quality of the refrigerant.
A crate of mass 45.0 kg is being transported on the flatbed of a pickup truck. The coefficient of static friction between the crate and the truck's flatbed is 0.300, and the coefficient of kinetic friction is 0.210.
Fluorine-18 undergoes positron emission with a half-life of 1.1x10^2 minutes. If a patient is given a 248mg dose for a PET scan, how long will it take for the amount of fluorine-18 to drop to 83mg?
A baseball leaves a pitcher's hand horizontally at a speed of 160 km/h. The distance to the batter is 18.3 m. Neglect air resistance. a) How long does the ball take to travel the first half of the distance?
What do the terms "activating", "deactivating", "ortho, para-directing" and "meta-directing mean. How do these relate to aniline, the anilinium ion (protonated aniline), and acetanilide?
At 20 degrees c, what is the minimum diameter of the Cu wire, such that no more than 1% of the produced power is "consumed" by the resistance of the wire?
A solution containing 10 mmol of CO3-- and 5.0 mmol of HCO3- is titrated with 1.0 M HCl. What total volume of HCl must be added to reach the 2nd equivalence point?
Assume all the energy in the doughnut can be converted to mechanical energy. (Take 75 kg as the mass of a typical person.)
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