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The state test scores for 12 randomly selected high school seniors are shown on the right....

The state test scores for 12
randomly selected high school seniors are shown on the right. Complete parts​ (a) through​ (c) below.

Assume the population is normally distributed.

1427

1225

989

700

720

839

729

740

542

620

1442

946

​(a) Find the sample mean. x=

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