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The probability that there is no accident at a certain busy intersection is 91% on any...

The probability that there is no accident at a certain busy intersection is 91% on any given day, independently of the other days.
(a) [2 marks] Find the probability that there will be no accidents at this intersection during the next 4 days.
(b) [2 marks] Find the probability that in next 4 weeks there will be exactly 4 days with accidents.
(c) [2 marks] Today was accident free. Find the probability that there is no accident during the next 7 days, but there is at least one accident by the end of the 14th day.
Math   Statistics-And-Probability   
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