X

2

three

four

P

?

So what?

(2) The probability that a student will get a certificate in this exam is

(1) Let students pass the first exam of subject A as event A 1, pass the make-up exam of subject A as event A 2, pass the first exam of subject B as event B 1, and pass the make-up exam of subject B as event B 2.

According to the meaning of the question, the possible values of x are: 2, 3, 4 ... 2 points.

? Six points.

The distribution list of x is:

X

2

three

four

P

?

So ... eight points.

(2) Suppose that "the student obtained the certificate in this exam" is event C.

rule

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