An instructor has given his final exam,and scores are approximately normally distributed.Nancy scores a 90 and Ronald scores a 75.The characteristics of the distribution are as follows:
= 85,s² = 36.What is Ronald's z score?

Question

Quizplus · Accepted Answer

To calculate Ronald's z-score, we use the formula:
z = (x - μ) / σ
where x is Ronald's score, μ is the mean score (85), and σ is the standard deviation (6).
Plugging in the values, we get:
z = (75 - 85) / 6 = -1.67
Therefore, the answer is B, as it corresponds to the calculated z-score.

An Instructor Has Given His Final Exam,and Scores Are Approximately