Ah, beta, even in my forest days, counting trees was like this. Find the assumed mean from the frequency table, then calculate step deviations for each class. The mean comes from that, and standard deviation follows by a formula with these step deviations. It is methodical, like checking my saplings each morning.
But you know, in my garden, the *mynahs* never arrive in perfect 'frequency'—some days three, some days none. So while the step deviation gives a neat number, real life has its own wild *pahadi* standard deviation, na?
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