<image>From a certain school, 20 classes are randomly selected to survey the number of people with online shopping experience in each class. The obtained data is shown in the stem-and-leaf plot and frequency distribution histogram.



(1) Find the value of $$m$$ in the frequency distribution histogram; 
(2) If two classes are randomly selected from those with the number of people with online shopping experience in the interval [30, 40], find the probability that at least one of the classes has more than 36 people with online shopping experience.