I don't know how to calculate the following:\n\nOut of 67 students in an exam, coming from various schools, 10\nstudents didn't pass. Out of the 10 that didn't pass, 7 came from a\nparticular school that sent 9 students in total. What is the\nprobability that the 7 students that failed from the same school were\njust bad students versus the probability that they were not as\nadequetly prepared as the rest who passed the exam?\n\nThanks a lot for the help. This is not homework. I am teachning hair\nstyling.