"Jerry W. Lewis" wrote:
....
=SQRT(SUMPRODUCT(A5:A11*TRANSPOSE(A5:A11)*B15:B21) )
....

This formula must be array entered despite using SUMPRODUCT(), so you might
as well use SUM() to reduce it to
=SQRT(SUM(A5:A11*TRANSPOSE(A5:A11)*B15:B21))
which also must be array entered.

Jerry