Sick children: There are 21 students in Mrs. Bush's sixth-grade class. On a cold winter day in February, many of the students had runny noses and sore throats. After examining each student, the school nurse constructed the following table. Round the answers to four decimal places, as needed Sore Throat No Sore Throat 11 S Runny Nose No Runny Nose 3 Send data to Excel (a) Find the probability that a randomly selected student has a runny nose. (b) Find the probability that a randomly selected student has a sore throat. (C) Find the probability that a randomly selected student has a runny nose or a sore throat (d) Find the probability that a randomly selected student has neither runny nose nor a sore throat