z score for 40 = (40 - 30)/4 = 10/4 = 2.5
Hence,
P(X < 40)
= P(z < 2.5)
= 0.9938
X is a normally distributed variable with mean p = 30 and standard deviation o =...
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X is a normally distributed variable with mean μ = 30 and standard deviation σ = 4. Find P(x < 40)?
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