Mathematics, 27.02.2020 02:24, ayoismeisjuam

G A sample of 3 items is chosen at random from a box containing 20 items, out of which 4 are defective. Let X be the number of defective items in the sample. Find Var (X), σX, Var (20 − X) and σ20−X.

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G A sample of 3 items is chosen at random from a box containing 20 items, out of which 4 are defecti...