Sam is in charge of setting up rooms for parties at a hotel. On Saturday, there are two parties, one with 536 people and one with 544 people. Each table seats 8 people. How many total tables does he need for the two parties?

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”?