Demand in each period follows the same normal distribution (i.e., there is one demanddistribution that represents demand in any single period). Assuming demand is independent across periods, which of the following statements about the standard deviation ofdemand over five periods is true? a. It equals the standard deviation of demand over one period.b. It is greater than the standard deviation of demand over one period but less than fivetimes the standard deviation of demand over one period.c. It equals five times the standard deviation of demand over one period.d. It is even more than five times the standard deviation of demand over one period.

ENGR.ECONOMIC ANALYSIS
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Chapter1: Making Economics Decisions
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Demand in each period follows the same normal distribution (i.e., there is one demand
distribution that represents demand in any single period). Assuming demand is independent across periods, which of the following statements about the standard deviation of
demand over five periods is true?
a. It equals the standard deviation of demand over one period.
b. It is greater than the standard deviation of demand over one period but less than five
times the standard deviation of demand over one period.
c. It equals five times the standard deviation of demand over one period.
d. It is even more than five times the standard deviation of demand over one period.

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