Belle's bake shop makes croissants that cost $1.75 each. past experience shows that 10% of the croissants will spoil and have to be discarded. assuming belle wants a 45% markup based on cost and produces 300 croissants, each croissant should sell fo

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”?