Problem it [10 pts]; A study has shown that 20% of all college textbooks have a price of $160 or higher. It is known that
Problem it [10 pts]; A study has shown that 20% of all college textbooks have a price of $160 or higher. It is known that the standard deviation of the prices of all college textbooks is $150. Suppose the prices of all college textbooks have a normal distribution. What is the mean price of all college textbooks
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