1- From past results, a professor knows that the test scores are normally distribution with a mean 78 and a variance known to be 10. What is the probability that a student will score between 75 and 93?

0.9999

0.8826

0.9333

0.8286

2- From past results, a professor knows that the test score of a student taking her final examination is a random variable with mean 84 and a variance known to be 10. What is the probability that a student will score between 75 and 93?

0.8765

0.9032

0.8065

0.8889