Hi,

*Note: 

P(26< X <40)

z = 40-30/5 = 2

z = 26-30/5 = -.8

using the excel normdist functon

NORMSDIST(2)   = .97725

NORMSDIST(-0.8)= .21186

P(26< X <40) = .97725 - .21186  = .76539



P(x>45)

z = 45-40/5 = 1

NORMSDIST(1)= .841345

P(x>45) = 1 - .841345 = .15866 

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