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October 20, 2014

Homework Help: Probability

Posted by Anonymous on Friday, April 30, 2010 at 2:09am.

The public transport system is aware that one person in twenty does not buy a ticket for their trip. The manager decides to challenge 200 travelling people as to charger they have a valid ticket or not.
(a) calculate the probabilty that everyone had a ticket,
(b) calculate the probabilty that at most 3 people had no ticket, and
(c) calculate the probabilty that between 7 and 14 (inclusive) had no ticket. I thought binomial? But then 200 is too big for it? Thanks for any help!

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