Sally bought five dozen eggs from the grocery store to bake some cakes. she plans to bake the cakes. she plans to bake the cakes over eight days. how many eggs did sally buy.

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”?