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The mean score for freshmen on an aptitude test at a college is 540, with a standard devistion of 50. In a random sample of

The mean score for freshmen on an aptitude test at a college is 540, with

a standard devistion of 50. In a random sample of 400 students, nd the

probability that

(a) there are at least 20 students score higher than 620.

(b) there are between 360 to 390 (inclusive) students score between 440 to

640.

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