Students in a classroom claim that they don’t have enough time to study due to too much homework being assigned to them. A teacher is interested to determine the time his students spend in completing homework assignments per day. He found that the time his students spent on homework assignments is approximately normally distributed with an average of 3.2 hours per day. The teacher also found that 11% of his students were studying more than 5 hours per day. Based on the given information, find the standard deviation for the distribution of students’ time spent in homework assignments per day.