The random variable x represents the number al credit cards that acults have along with the corresponding probabilities. Find the mean and standard deviation OA mean: 1.30, standard deviation 0 4 OB mean: 1.30, standard deviation 0.32 P(x) OC mean: 1.23, standard deviation: 0.66 01 0.07 O D. mean: 1.23; standard deviation: 0.44 068 0.21 3 0.03 4. 0.01

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