Question: The grade-point average in an econometrics examination was normally distributed with a mean of 75. In a sample of 10 percent of students it was

The grade-point average in an econometrics examination was normally distributed with a mean of 75. In a sample of 10 percent of students it was found that the grade-point average was greater than 80. Can you tell what the s.d. of the grade-point average was?

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