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This question: 2 point(s) possible NIC LLI Groups of adults are randomly selected and arranged in groups of three. X P(x) The random variable x is the number in the group who say that they 0 0.361 would feel comfortable in a self-driving vehicle. Determine whether a 1 0.441 probability distribution is given. If a probability distribution is given, find its mean and standard deviation. If a probability distribution is not given, 2 0.176 identify the requirements that are not satisfied. 3 0.022 J B. No, the random vanable x is caregoncal Instead of numerical. C. No, not every probability is between 0 and 1 inclusive. D. No, the random variable x's number values are not associated with probabilities. E. No, the sum of all the probabilities is not equal to 1. Find the mean of the random variable x. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. (= adult(s) (Round to one decimal place as needed.) O B. The table does not show a probability distribution. Find the standard deviation of the random variable x. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. = adult(s) (Round to one decimal place as needed.) O B. The table does not show a probability distribution