The table below is the probability table for a random variable X. Find E(X), Var(X), and the standard deviation of X.
A. E(X) = -0.2; Var(X) = 2.16; standard deviation of X =1.47
B. E(X) = -0.2; Var(X) = 4; standard deviation of X =2
C. E(X) = -0.2; Var(X) = 2.22; standard deviation of X =1.49
D. E(X) = -0.2; Var(X) = 0; standard deviation of X = 0
E. none of these
Answer: A
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Multiply.(3n9 + 2)(3n9 - 2)
A. 9n18 + 4 B. 9n18 - 4 C. 9n18 - 6n9 - 4 D. 3n18 - 4
Provide the proper response.What type of variation is suggested by the graph?
A. y varies inversely as x. B. y varies directly as the square of x. C. y varies directly as x. D. y varies inversely as the square of x.
Find the difference.
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A. 
B. 
C. - 
D. 
A nationwide survey conducted by the National Cancer Society revealed the following information: Of 10,000 people surveyed, 3,200 were "heavy coffee drinkers" and 160 had cancer of the pancreas. Of those who had cancer of the pancreas, 133 were heavy coffee drinkers. ? Using the data in this survey, determine whether the events "being a heavy coffee drinker" and "having cancer of the pancreas" are dependent events. ?
A. yes B. no