Student practice hours

name mon tues wed thu fri
mick 4 4 3 4 4
ashley 4 3 2 4 5
aj 4 4 4 4 3
isabella 4 5 3 4 4

all clark-atlanta band students are required to document their practice time in the band hall. the band averages 4 hours of practice per day during the week. four students' logs are chosen at random. based on the table above, find the difference between the mean of the sample and the entire band.
a.
the difference is 0.9 hours.
b.
the difference is 0.2 hours.
c.
the difference is 0.05 hours.
d.
the difference is 0 hours.