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what is the positive difference between Ronald's height and the mean height?

with a height of 68in , Ronald was the shortest president of a particular club in the past century. The club presidents of the past century have a mean height of 71.4 in and a standard deviation of 2.6 in. How many standard deviations is that for the difference? 
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The difference is (68-71.4)=-3.4" Below the mean. or -3.4/2.6=-1.31 standard deviations below the mean.