A leading cell phone company forecasts that next year it will sell 3 million units of its

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A leading cell phone company forecasts that next year it will sell 3 million units of its bestselling phone. In the past, actual sales have been unbiased, with forecast errors having a standard deviation equal to 10 percent of the forecasted sales. What are the chances that fewer than 2.5 million phones will be sold next year?

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