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The random variable X represents the number of credit cards that adults have along with the corresponding
probabilities. Find the mean and standard deviation of X.
X P(X)
(Choose 1 answer)
☐ A
A. None of the other choices is correct
0 0.49
B. mean: 1.18; standard deviation: 0.64
1 0.05
☐ D
C. mean: 1.39; standard deviation: 0.80
2 0.32
3 0.07
☐ E
D. mean: 1.39; standard deviation: 0.64
4 0.07
E. mean: 1.18; standard deviation: 1.30
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