A factory process requires 3 steps to finish a product. The steps each have a mean completion time of A= 10 seconds and a standard deviation of o = 5 seconds. The time it takes to complete each step is independent from the other steps. Let T be the total completion time for the 3 steps. Find the standard deviation of T.

Choose 1

OT = 15 seconds

Or = 75 seconds

or 15 seconds

or = v75 seconds