Posted by **CB** on Sunday, May 23, 2010 at 11:01am.

The probability that a school bus is late is 0.04. How many times would you expect the bus to be late in a 5-week period?

- Math -
**drwls**, Sunday, May 23, 2010 at 11:23am
That's 25 school days. The average or "expectation" number of late appearances will be 25x0.04 = 1.0, but there are non-zero probabilities of 0,2,3, etc. late appearances as well. The binomial distribution can be used to calculate their probabilities.

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