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OB. Systematic sampling OC. Simple random sampling D. Cluster random sampling QUESTION 6 For a normal distribution with mean equal to 80 and standard deviation

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OB. Systematic sampling OC. Simple random sampling D. Cluster random sampling QUESTION 6 For a normal distribution with mean equal to 80 and standard deviation equal to 3, approximately what percent of the observation will be between 74 and 86? A. 50% B. 68% OC. 99.7% OD. 95% QUESTION 7 Which of the following is not true in a standard normal distribution

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