point(s) possible In the following probability distribution, the random variable x represents the number of activities a parent of a 6th- to 8th-grade student is involved in. X 0 2 3 4 P(x) 0.078 0.324 0.342 0.105 0.151 . . . Compute and interpret the mean of the random variable x. The mean is |activities. (Type an integer or a decimal. Do not round.) Compute the standard deviation of the random variable x. The standard deviation is |activities. (Round to one decimal place as needed.)