$[$Multiple answer$]$ Identify an error $($or errors$)$ in the function below

Function meanvalue$($ByRef a$()$ As Integer, ByVal total$\_$num As Integer$)$ As Single

Dim sum As Integer

For $i=1$ To total$\_$num

sum $=$ sum $+a(i)$

Next i

meanvalue $=$ sum $\frac{?}{?}$ total$\_$num

End Function

$q,$

The action of meanvalue $=$ sum $/$ total$\_$num should le corrected as meanvalue$=$sum$/($total$\_$num$-1)$

The input argument a$()$ is an array and must be transferred using ByVal

Loop index i is not declared

The variable sum is not initialised