An array issue with NormDist function

hi all,
im beginner in amibroker, but whaen i want use NormDist function as we use it in excel i face error message that "im using array instead of number?
i just want to get NormDist every week data so that i want use array in this case.
if i use number that is mean i cannt back tested!!
any idea to help please

@ahanazi,

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