Demand in each period follows the same normal distribution t:i.e.. there is one demand distribution that represents demand in am,r single period). Assuming demand is independent aoross periods. which of the following statements about the standard deviation of demand over 5 periods is true? Olt equals the standard deviation of demand overt period. Olt is greater than the standard deviation of demand overt period. but less than 5 times the standard deviation of demand over 1 period. Olt equals 5 times the standard deviation of demand over 1 period. .It is even more than 5 times the standard deviation of demand over 1 period