Final answer:
Fredo earned a 95% in his world culture course, which generally corresponds to an A letter grade and 4.0 grading points in most grading systems.
Step-by-step explanation:
To calculate Fredo's percentage of points earned in his world culture course, divide the number of points he scored by the total number of points possible and then multiply by 100. Fredo scored 342 points out of a possible 360 points. So, his percentage is ((342/360) x 100) = 95%. According to conventional letter grading systems, a 95% is typically considered an A grade. In many grading systems, an A is equivalent to 4.0 grading points.
Therefore, the correct answers are: Fredo's percentage of points earned is 95%, his letter grade is A, and his grading points would be 4.0.