Answer
N=20, n= 5, r=6,
N=8, r=3, n =4
X denotes number of defective keyboard in box
a. x=2
$P(X=0) = \frac{5C_0\times 15C_5}{20C_5}$ =0.1937
b.
$P(X=1) = \frac{5C_1\times 15C_4}{20C_5}$ =0.4402
Work Step by Step
no
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