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?

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?