16
17
18
19
20
P
?
Examination analysis: (1) According to the figure, the frequency of B-level in the subject of "Mathematics and Logic" is 0.250, and the number of people who are told that B-level in the subject of "Mathematics and Logic" is 10, so the total number of students in the class is 65,438. In fig. 2, the frequencies of grades e, d, c and b have been given. From this, we can get the number of people who get an A in reading and expression. (2) The first determined values can obviously be 16, 17, 18,19,20. This is a classical probability, and the distribution table can be obtained by finding the probability of each random variable.
(1) The total number of students in this class is 1.
The number of students who got a in reading and expression course is
3 points
The value of (2) can be 16, 17, 18,19,20.
, , ,
, ,? 8 points
So the distribution list is
16
17
18
19
20
P
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