Probability qn on time

[Nikvar]

The probability of jolene arrives the school before and after school start time 0730 is 4/5 and 1/20 respectively.
what is the probability that jolene reaches school on time
Over a period of 100 days estimate the number is days that jolene will be late to school

 

[Dr.Peterson]

There are three events in view here. What are they? What do their probabilities necessarily add up to?

What does probability mean? Apply that to the second question.

Then show us your thinking. We don't just give you free answers:

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