Calculates the population standard deviation of the input values. Use if the values encompass the entire population of data you want to represent and do not wish to generalize about a larger population. $stdDevPop ignores non-numeric values.
5.0
https://docs.mongodb.com/manual/reference/operator/aggregation/stdDevPop/#mongodb-expression-exp.-stdDevPop
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Calculates the population standard deviation of the input values. Use if the values encompass the entire population of data you want to represent and do not wish to generalize about a larger population. $stdDevPop ignores non-numeric values.
5.0
https://docs.mongodb.com/manual/reference/operator/aggregation/stdDevPop/#mongodb-expression-exp.-stdDevPop