Question 1182925
z=(x-mean)/sd
>(14-12)/2.5 is z>0.8 with probability 0.2119
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< (10-12)/2.5 is z < -0.8 with same probability of 0.2119
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between 12 and 17, this will be with z between 0 and 2 with probability 0.4772
also 2ndVARS 2 normalcdf(12,17,12,2.5) ENTER
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greater than 21 will be a z>9/2.5 or 3.6 with probability 0.00016. This is very low probability from a statistical standpoint and by age 15 without one a girl has the diagnosis of primary amenorrhea and should be evaluated for hormonal and other issues.