Question: How do I find the mean and standard deviation from these figures? After reviewing the sales history of similar products, QEs senior sales forecaster predicted

How do I find the mean and standard deviation from these figures? After reviewing the sales history of similar products, QEs senior sales forecaster predicted an expected demand of 200,000 units with a .90 probability that demand would be between 120,000 units and 280,000 units. (Hint: The Z-score associated with a 90% confidence interval is 1.645.)

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