Are good grades in high school associated with family togetherness? a simple random sample
of 142 high-school students was asked how many meals per week (x) their families ate together.
their responses produced a mean of ¿x = 3.78 meals per week, with a standard deviation of2
sx = 2.2. researcherss then matched these responses against the students' grade point averages (gpas). the scatterplot appeared to be
reasonably linear, so they created a regression line. no apparent pattern emerged in the residuals plot. the equation of the line was gpa=2.73+.11(meals).

what was the mean gpa ?