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The stale test scores for 12 randomly selected high school seniors are shown on the right. Complete parts (a) through (c] below 1423 1226 593

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The stale test scores for 12 randomly selected high school seniors are shown on the right. Complete parts (a) through (c] below 1423 1226 593 120 Assume the population is normally distributed 831 729 540 1446 940 In) Find the sample mean =(Round to one

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