The midterm scоres оf аn Intrоductory Stаtistics clаss are bell-shaped, with a mean of 81 and a standard deviation of 6. (Round to 3 decimal places as needed) a. Calculate the z-score of a student scoring an 94 on the midterm. [a] b. Approximately what percentage of students scored between a 75 and 93? [b] c. Approximately what percentage of students scored below a 69? [c]