The annual sales of romance novels follow the normal distribution. However, the mean and the standard deviation
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The annual sales of romance novels follow the normal distribution. However, the mean and the standard deviation are unknown. Forty percent of the time sales are more than 470,000, and 10% of the time sales are more than 500,000. What are the mean and the standard deviation?
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Related Book For 
Statistical Techniques in Business and Economics
ISBN: 978-0078020520
16th edition
Authors: Douglas Lind, William Marchal
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