The results of an exam in a history class are normally distributed with a mean of 60 and a standard deviation of 6

Question

a. What is the probability that a student who took the exam will have a score between 57 and 63?

b. What is the probability that a student who took the exam will have a score between 45 and 75?

Answer 1

See my answer for your other question:

 

https://www.wyzant.com/resources/answers/192913/an_exam_is_given_to_all_students_entering_school_the_scores_are_approximately_normally_distributed_with_a_mean_of_100_and_a_standard_deviation_of_15