Use the probability distribution to complete parts (a) and (b) below The number of schoolrelated extracurricular activities per student Activities 0 1 2 3 4 5 6 7 Probability 0.059 0.121 0.163 0.179 0.218 0.127 0.082 0.051 (a) Find the mean, variance, and standard deviation of the probability distribution The mean is I (Round to one decimal place as needed.)