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Answer by Michael Hardy for Normal Random Variables: Plotting CDF/Variance
$$0.1=\Pr(X>4) = \Pr\left(\frac{X-\text{mean}}{\text{standard deviation}} > \frac{4-\text{mean}}{\text{standard deviation}}\right)$$$$= \Pr\left(\frac{X-3}{\sigma} >\frac{4-3}{\sigma}\right) =...
View ArticleNormal Random Variables: Plotting CDF/Variance
So I'm trying to get an edge on Discrete Math for next fall, and I'm working on this problem:Suppose that X is a normal random variable with mean 3. If P{X > 4} = 0.1, what is the variance of X?...
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