Hi

Below:  z = 0, z = ± 1, z= ±2 , z= ±3 are plotted.  

Note: z = 0 (x value the mean) 50% of the area under the curve is to the left 

and %50 to the right



Suppose that in a group of people you find that X percent of people in the group have 

heights that are greater than the average (that is, the mean) height in that group.

b) X can be any percentage as long as it is less than 50%. 

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