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18) In its standardized form, the normal distribution A) has a mean of O and a standard deviation of 1. B) has a mean of 1 and a variance of 0. C) has an area equal to 0.5. D) cannot be used to approximate discrete probability distributions. 19) Which of the following about the normal distribution is not true? A) Theoretically, the mean, median, and mode are the same. B) About 68% of the observations fall within 11 standard deviation from the mean. c) It is a discrete probability distribution D) Its parameters are the mean, and standard deviation, o. 20) In right-skewed distributions, which of the following is the correct statement? D A) The distance from Q1 to Q2 is greater than the distance from 92 to Q3, B) The distance from Q1 to Q2 is less than the distance from Q2 to 23. C) The arithmetic mean is less than the median. D) The mode is greater than the arithmetic mean.
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