Find the expected value of the random variable in the experiment.A bag contains six marbles, of which four are red and two are blue. Suppose two marbles are chosen at random and X represents the number of red marbles in the sample.

A. 1.33
B. 1
C. 1.4
D. .933


Answer: A

Mathematics

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A. 1
B. 11
C. 3
D.

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Provide an appropriate response.The cost C of processing exhaust gases so that you remove all but x percent of the pollutants is given by  Find the values of x for which C < 0. Discuss the meaning of the results.

What will be an ideal response?

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Give an appropriate answer.Letf(x) = -5 andg(x) = -7. Find[f(x) - g(x)].

A. 2 B. -5 C. -12 D. -1

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Simplify.- x +  - x - 4

A. - x + 
B. - x - 
C. x - 
D. - x - 

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