Groups of adults are randomly selected and arranged in groups of three. P(x) The random variable x is the number in the group who say that they 0.356 would feel comfortable in a self-driving vehicle. Determine whether a 0.432 probability distribution is given. If a probability distribution is given, find its mean and standard deviation. If a probability distribution is not given, 0.190 identify the requirements that are not satisfied. 0.022 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