Although controversial and the subject of some recent law​ suits, some human resource departments administer standard IQ tests to all employees. One IQ​ test's scores are well modeled by a Normal model with mean 100 and standard deviation 11. If the applicant pool is well modeled by this​ distribution, a randomly selected applicant would have what probability of scoring in the following​ regions? ​
a) 67 or below ​
b) Below 100 ​
c) Between 89 and 111
​d) Below 78