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Please help 3. A variable is normally distributed. Determine the proportion of values in this normal distribution that is: a. within 1.0 standard deviation of

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3. A variable is normally distributed. Determine the proportion of values in this normal distribution that is: a. within 1.0 standard deviation of the mean: b. within 2.0 standard deviations of the mean: 4. If a variable is distributed with u = 20 and o = 16, what are the z-scores for the following values? a. 28 b. 18 c. 10 d. 23

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