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Mathematics, 01.10.2019 00:10 mprjug6

About ten percent of users do not close windows properly. suppose that windows is installed in a public library that is used by random people in a random order. (a) on the average, how many users of this computer do not close windows properly before someone does close it properly? (b) what is the probability that exactly 8 of the next 10 users will close windows properly?

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