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Statistics problem

With the height of 67 inches, Ronald with the shortest president of a particular club in the past century. The club president of the past century have a mean height of 7.8 inches and a standard deviation of .8 inches

a. What is the positive difference between Ronald’s height and the mean?

b. How many standard deviations is that [the difference found in part (a)]?

c. Convert Ronald’s height to a Z score

d. if we consider “usual” heights to be those that convert to Z scores between -2 and two, is Ronald’s height usual or unusual?

The positive difference between Ronald's height and the mean is ? in.

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