6. (10%) A random variable \( X \) follows lognormal distribution, \( \log X \sim N(\mu, \sigma^2) \). Derive the probability density function of \( X \).
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6. (10%) A random variable \( X \) follows lognormal distribution, \( \log X \sim N(\mu, \sigma^2) \). Derive the probability density function of \( X \).