90. The figure below shows the test performance statistics of Class 6(1). The horizontal axis represents the number of questions answered correctly (unit: questions). The vertical axis represents the number of people who answered correctly (unit: people).
(1) Class 6(1) has a total of $\qquad$ students.
(2) The percentage of students who answered 8 or more questions correctly is $\qquad$ $\%$.
(3) The percentage of students who answered 5 or fewer questions correctly is $\qquad$ $\%$.
Reference answer: $40,20,45$