In a bag of 50 marbles, 20 marbles are blue or pink. What percentage of marbles are blue or pink?

Enter the missing values in the boxes to complete the ratio table.

Thanks.

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”?