The probability that a FEDEX delivery man meets someone at a random home to sign for...

The probability that a FEDEX delivery man meets someone at a random home to sign for a delivery that requires signature is 80%. If FEDEX delivery men call at 9 random homes to make such a delivery what is the probability that

(a) people are at home to sign in one or six homes

(b) people are at home to sign in exactly 8 homes

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orchestra answered 2 years ago

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