At a particular hospital, records show that each day, on average, only 80% of people keep their

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At a particular hospital, records show that each day, on average, only 80% of people keep their appointment at the outpatients' clinic. Find the probability that on a day when 200 appointments have been booked,

(a) more than 170 patients keep their appointments,

(b) at least 155 patients keep their appointments.

(b) exactly 20 in a random sample of 100 people,

(c) eta 200 in a random sample of 1000 people.

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