One thousand and twenty students participated in the school math contest.

sample 1 is a random sample from grades 9 and 10 and consists of the following scores: 72, 89, 67, 81, 75, 79, 81, 80, 62, 64, 83.

sample 2 is a random sample from grades 11 and 12 and consists of the following scores: 84, 86, 87, 84, 86, 89, 90, 87, 87, 84, 86.

choose the following statements that correctly compare the two samples.
check all that are true.

a). sample 2 shows 11th and 12th grade students, on average, did better.

b) . sample 1 has a higher probability than sample 2.

c). the measure of center is the same for both samples.

d). sample 1 shows 9th and 10th grade students, on average, did better.

e). sample 2 has a higher median score than sample 1.