Normdist for reliability?

T

Trs80

If given MTBF and standard deviation can the reliabilty be predicted at a
defined operational range using Excels Normaldistribution?

say mtbf = 50, sd= 20, then plug in the operating duration.
NORMDIST(operating duration, 50, 20, true).
Is that a way to calculate reliability at a specifed duration?
thanks!
 

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