Re: [理工] [機率]-機率
※ 引述《AAJJBurnett (叫我投手)》之銘言：
: 1.Suppose there are 3 defective items in a lot of 50 items. A sample
: of size 10 is taken at random and without replacement. Let X denote the
: number of defective items in the sample. Find the probability that the
: sample contains
: (a)Exactly 1 defective item
: (b)At most 1 defective item
(a)
C3取1 * C47取9
---------------
C50取10
(b)
C3取0 * C47取10 C3取1 * C47取9
--------------- + ----------------
C50取10 C50取10
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