Note: Enter your answer and show all the steps that you use to solve this problem in the space provided. Stephen read a 90-page book in 6 days. If he continues reading at that rate, how long will it take him to read a 300-page book?

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”?