Analysis: (1) If X people suffer from "influenza A", then the meaning of the problem is that if

The solution is x = 1 or x =4 (s).

∴ Among the five patients with fever, 1 person suffers from "influenza A", and the ......................................................................................................... score is 5.

(2) = 1, 2, 3, 4, then,

, .

The distribution list is

ξ

1

2

three

four

P

...................................... 10.

∴ .？ ............................ 12.

leave out