In a mobile network company, one in every seven subscribers is in a conversation with other subscriber in the network from 8PM to 9PM. What is the probability that when 9 mobile numbers are chosen, only 4 are in use? Round to four decimal places.

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Q: A poll showed that among potential voters, 36% support Candidate A in the upcoming election, 36%…

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Q: In a survey of 1000 social-media account holders aged 18 years and older conducted by a certain…

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Q: A class has six students. What is the probability that at most four of the students were born on a…

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Q: In a mobile network company, one in every seven subscribers is in a conversation with other…

A: