Hi

µ = 12, σ = 5

P (12 < x < 18) = P(z=(18-12)/5 - P(z =(12-12)/5 = P(z=1.2) -.5 =  .8849 - .5 = .3849

Note:Using the Excel function,  NORMSDIST(1.2)= .8849 and NORMSDIST(0)= .5 

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