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Calculating the standard deviation of demand

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During replenishment of blue diamonds, it is shown that the average demand per period is 4 and the average lead time is 3 per period. What is the standard deviation of demand during replenishment of blue diamond if the standard deviations of demand per period and lead time are 1.2 and 1.5, respectively.

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Solution depicts the steps to estimate the standard deviation of demand during replenishment.

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Discrete Distribution: Calculating Expected Return, Standard Deviation and CV

A stock's return has the following distribution:

Demand for the Probability of This Rate of Rate of Return if This Company's Products Demand Occurring Demand Occurs

Weak 0.1 (50%)
Below average 0.2 (5)
Average 0.4 16
Above average 0.2 25
Strong 0.1 60
1.0

Calculate the stock's expected return, standard deviation, and coefficient of variation.

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