[理工] 一題機率
1.A class has three students. They toether participate in 10 courses.
Each student has one favorite course. Let X be the number of courses
that are the favorite courses of at least one student. Suppose that a
student is equally likely to favor any of the 10 courses. Find E[X]=?
我算出來是3 可是答案好像不是(忘了)
希望高手解答瞜!
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推
12/28 22:06, , 1F
12/28 22:06, 1F
推
12/28 22:20, , 2F
12/28 22:20, 2F
→
12/29 10:04, , 3F
12/29 10:04, 3F
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