Solution :
Given that ,
mean = = 45
standard deviation = = 12
P(x > 39) = 1 - P(x < 39)
= 1 - P[(x - ) / < (39 - 45) / 12]
= 1 - P(z < -0.5)
= 1 - 0.3085
= 0.6915
P(x > 39) = 0.6915
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