Suppose the demands in successive weeks for your product are normally distributed with a mean of 100 and a standard deviation of 20 and suppose your lead time for receiving a placed order is three weeks. A quantity of interest to managers is the lead-time demand, the total demanded over three weeks. Why does the formula for the standard deviation of lead-time demand include a square root of 3? What assumptions are behind this? Please Type out the answer , no screenshots or attachments