So 29 students in this class passed the math exam. (3 points)
(2) According to the histogram, the number of people who scored within [50,60] is 50× 10×0.004=2,
Set the score to x and y(5 points).
The number of people in [90, 100] is 50× 10×0.006=3, and the scores are A, B, C, (6 points).
If there is only one case of m, n ∈ [50 50,60] and xy, (7 points)
If m, n ∈ [90, 100], there are three cases of ab, bc and ac, (8 points).
If m and n are within [50, 60] and [90, 100] respectively, there are
* * * There are six situations, so the total number of basic events is 10, (9 points).
The event "| m-n | > 10" contains six basic events (10 point).
∴P(|m？ N | > 10) = 6 10 = 35。 (12)