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Mathematics 9 Online
OpenStudy (anonymous):

the time taken by the customers to settle a invoice is normally distributed with mean 20 days and standard deviation 5 days. A discount is given for every invoice settled in less than 12 days 1) find the probability that an invoice is settled in 18 to 26 days 2) find the probability that exactly 2 out of 10 invoices are given discounts p.S please show the workings. thankyou

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