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a box of 400 ipads has 50 defective and the rest are good quality. A sample...

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Statistics

a box of 400 ipads has 50 defective and the rest are goodquality. A sample of 20 ipads is selected at random withoutreplacement. Find the probablity that of the sample selected:

(a) there is exactly 1 defective calculator.

(b) there is at least 1 defective calculator.

(c) there is at most 1 defective calculator

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