February 28, 2017

Homework Help: statistics

Posted by K.T on Sunday, January 3, 2010 at 4:11pm.

the average of final exam is 64, the standard deviation is 7. If the teacher set a rule that 1/4 of students who receive the poor grades should stay after class. lower than what mark should the students stay in school?

does anyone know how to solve this?

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