The random variable x represents the number of credit cards that adults have along with the corresponding probabilities. Find the mean and standard deviation. X P(x) 0 0.07 1 0.68 2 0.21 3 0.03 0.01 4 O A. mean: 1.30; standard deviation: 0.44 OB. mean: 1.23; standard deviation: 0.44 OC. mean: 1.30; standard deviation: 0.32 O D. mean: 1.23; standard deviation: 0.66

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