between 15 and 22 = p(15<x<22) =p(15-23.5)/3.6 < (22-23.5)/3.6) = p(z<-1.53)+p(z>0.42) =0.04003 ( how as 0.04003 CALCULATED ?
It was got by looking up the standard normal table: for P(Z<-1.53) looking for the area of Z = -1.53, i.e. left of -1.53
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