1sth graders scored a mean of 25 and a sd of 5

5th graders scored a mean of 30 and an sd of 10; assume the distributions are normal

How do i figure out what percentage of the first graders scored better than the average 5th graders?

i did (30-25)/5 which gives me 1; the z-score percentile i get is 15.57% (smaller portion) but i dont think thats how you do it.

The second question asks which percentage of fifth graders scored lower than the average 1st grader. But I will end up getting the same answer if i do it the same...