A _________valve would be selected for use with extremely corrosive materials.

a. globe
b. plug
c. diaphragm
d. ball


a. Incorrect. A diaphragm valve would be selected for use with extremely corrosive materials.
b. Incorrect. A diaphragm valve would be selected for use with extremely corrosive materials.
c. Correct. A diaphragm valve would be selected for use with extremely corrosive materials.
d. Incorrect. A diaphragm valve would be selected for use with extremely corrosive materials.

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Over a 1-week period, an officer of the state lottery commission sampled ticket purchasers at a single high-traffic location. The amounts labeled W for winnings, distributed back to the purchasers/winners, and the associated probabilities for 5000 tickets are shown below.

(a) Is this variable discrete or continuous? Plot the cumulative distribution of W by hand or spreadsheet, as instructed.
(b) Calculate the expected value of W per ticket.
(c) If tickets cost $2, what is the expected long-term income to the state per ticket, based upon this sample?

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