Find and , where X= a student's IQ Score.
Take those two probabilities and multiply each by the number of students that will be added to the school district. This will give you the number of students who have an IQ lower than 80 or higher than 135.
Now, just sum those two numbers and multiply them by additional cost that individualized instruction will be. This will give you the total amount of money that the city will have to set aside.