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9) The random variable x represents the number of credit cards that adults have along with9the corresponding probabilities. Find the mean and standard deviation. P(x)

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9) The random variable x represents the number of credit cards that adults have along with9the corresponding probabilities. Find the mean and standard deviation. P(x) 0.07 0.68 HNm 0.21 0.03 SH 0.01 A) mean: 1.30; standard deviation: 0.32 B)mean: 1.23; standard deviation: 0.44 C) mean: 1.30; standard deviation: 0.44 D) mean: 1.23; standard deviation: 0.66

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