public static Task<Nullable<double>> StandardDeviationPopulationAsync(
	this IMongoQueryable<Nullable<long>> source,
	CancellationToken cancellationToken = null
)

<ExtensionAttribute>
Public Shared Function StandardDeviationPopulationAsync ( 
	source As IMongoQueryable(Of Nullable(Of Long)),
	Optional cancellationToken As CancellationToken = Nothing
) As Task(Of Nullable(Of Double))

[<ExtensionAttribute>]
static member StandardDeviationPopulationAsync : 
        source : IMongoQueryable<Nullable<int64>> * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _cancellationToken = defaultArg cancellationToken null
*)
-> Task<Nullable<float>>