Scores on the common final exam in Elementary Statistic course are normally distributed with mean 70 and standard deviation 10. The department has the rule that in order to receive an A in the course...

Scores on the common final  exam in Elementary Statistic course are normally distributed with mean 70 and standard deviation 10.

The department has the rule that in order to receive an A in the course his score must be in top 10% of all exam scores. The minimum exam score to receive A is about