14. How many 5-character license plates can be made if the first 3 characters are letters and last 2 characters are numbers? Repetition of characters allowed but the first letter must be
a P, W, Q, E, L, or K?
a. 1.757,600
b. 1,560,000
c. 405,600
d. 365,040

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?