Tuesday
July 22, 2014

Homework Help: final exam

Posted by Anonymous on Tuesday, May 21, 2013 at 8:46pm.

a study shown that 20% of all college textbooks cost at least $70.it is known that the standard deviation of the prices of all college textbook is $9.50.assuming that prices of all college textbooks follow a normal distribution, find the mean price of all college textbooks.

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