(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

If one bar of a histogram has been generated with ##n## entries from a total of ##x## measurements, i.e. the event occurs randomly ##n## times in the ##x## event interval, then what is the standard deviation of values in this bar? Let ##k## be the range of values that could have been measured for this particular bar of the histogram, and assume that the expectation value of ##k## is ##n##.

2. Relevant equations

3. The attempt at a solution

I'm finding the wording tricky to understand. ##n## is the number of events in the interval, and the average value of ##k## is also ##n##? The variance is the square of the distance from the mean and if all the events were equally likely, I'd divide by ##n## and have something like

##\frac{1}{n}\Sigma(k_i - n)^2##

But I'm not sure that's what it means when it says the event occurs randomly a total of ##n## times. I'd really appreciate any hints on how to tackle this, thanks for any help!

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# Homework Help: What's the standard deviation of values in the histogram bar

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