Pedro makes a loaf of bread that weighs 24 ounces. He gives 1/3 of the loaf to his sister and 20% of the loaf to his friend. He eats the rest himself. How much bread,
nounces, does Pedro eat?

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”?