The only thing we didn't think about very much was the 23. We counted n = number of inspections. I began to wonder if we have a finite number of pipes and we should be counting n = number of pipes.
Since we correctly calculated the mean, let's try n*p = 9/23 again.
Since we can have as many inspections as desired, that may be considered infinite - quite inappropriate for the Binomial Distribution.
Since there are only six pipes, I guess, things should work out.
"Unique Answers Don't Care How You Find Them." - Many may have said it, but I hear it most from me.
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