The ratings from a survey taken by 90 students are summarized in the frequency bar graph below. The possible ratings on the survey are 0, 1, 2, 3, and 4.

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We can take the sum of all of the ratings and divide by 90.

$$ 5(0) + 10(1)+25(2)+40(3)+10(4) $$ $$ = 0+10+50+120+40 $$ $$ = 220$$ $$ \frac{220}{90} = \frac{22}{9} =\boxed{2\frac{4}{9}} $$