Question 373584
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Hi,
*Note: {{{z = (X - mu)/sigma}}}
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