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Scores of high school students on a national mathematics exam in Egypt were normally distributed with a mean of 86 and a standard deviation of 4.

10. Scores of high school students on a national mathematics exam in Egypt were normally distributed with a mean of 86 and a standard deviation of 4.
What is the probability that a randomly selected student will have a score of 80 or higher?
If there were 97,680 students with scores higher than 91, how many students took the test?

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