Two groups of students were asked how far they lived from their school. the table below shows the distances in miles

group a (distance in miles) 1 1.5 3.03 3.2 2.8 1.5 1.8 2.5 2.2
group b (distance in miles) 2 2.5 3.23 1.3 1.8 2.4 3 1.5 1.8

which statement best compares the mean distances for the two groups?

it is equal for group a and group b.

it is greater for group b than group a.

its value for group a is double the value for group b.

its value for group b is double the value for group a.