normalCumulative(x, mu, sigma)
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This function computes the cumulative probability, Pr(X ≤ x), where X is a normally distributed random variable whose mean is mu and standard deviation is sigma .
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normalDensity(x, mu, sigma)
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This function calculates the derivative of Pr(X ≤ x). It produces the normal curve with a mean mu and standard deviation sigma .
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normalQuantile(c, mu, sigma)
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The normal quantile function computes the value x, such that Pr(X ≤ x) = c.
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