Asalsa recipe use green pepper, onions, and tomato in the extended ratio 1: 3: 5. how many cups of onion are needed to make 24 cups of salsa?

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”?