4.26 Students in a large accounting class were asked to rate the course by assigning a score of 1, 2, 3, 4, or 5 to the course. A higher score indicates that the students received greater value from the course. The accompanying table shows proportions of students rating the course in each category.

Rating 1 2 3 4 5 Proportion 0.07 0.19 0.28 0.30 0.16 Find the mean and standard deviation of the ratings.