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17. In a study of the prevalence of marijuana use among students, the marijuana use is measured in a continuous scale. The mean of the

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17. In a study of the prevalence of marijuana use among students, the marijuana use is measured in a continuous scale. The mean of the marijuana use scale is Q and the standard deviation is . Assume a normal distribution. a. Calculate the proportion of students whose marijuana use is i. 8.45 9.4. b. Calculate the value of c such that i. P(marijuana use

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