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question 4 4-The grade distribution of a recent exam follows a normal distribution with the following summary: Mean = 78 pts Median = 78 pts

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4-The grade distribution of a recent exam follows a normal distribution with the following summary: Mean = 78 pts Median = 78 pts Variance =16 pts a) Approximately what percentage of students scored more than \"mean plus two standard deviation\"? [P > (y + 20)] (10 pts) b) About what percentage of students scored less than the\" mean + one standard deviation?\" [P

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