Groups of adults are randomly selected and arranged in groups of three. the random variable x is the number in the group who say that they would feel comfortable in a self-driving vehicle. determine whether a probability distribution is given. if a probability distribution is given, find its mean and standard deviation. if a probability distribution is not given, identify the requirements that are not satisfied. x p(x) 0 0.354 1 0.436 2 0.187 3 0.023