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John gets 70% for a Physics exam and would like to know where he stands in relat...

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John gets 70% for a Physics exam and would like to know where he stands in relation to the rest of the class. Suppose all students' mean mark is 60%, and the standard deviation is 6. How would you calculate the z-score?

z=(6-70)/60=(-64)/60=-1.1

z=(60-70)/6=(-10)/( 6)=-1,6

z=(70-6)/60=64/( 60)=1.1

z=(70-60)/6=10/6=1.6

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