Answer:
The probability that a randomly selected student received a C or higher is 0.5160.
Step-by-step explanation:
Let <em>X</em> = scores received in an exam.
The random variable <em>X</em> follows a Normal distribution with parameters <em>μ</em> = 70.5 and <em>σ </em>= 12.5.
The stats instructor also graded the exams.
The grades were allotted as follows:
<u>Scores</u> <u>Grades</u>
> 90 A
90 - <80 B
80 - <70 C
70 - <60 D
60 < F
Compute the probability that a randomly selected student received a C or higher as follows:
P (C or higher) = P (X > 70)

*Use a <em>z-</em>table for the probability.
Thus, the probability that a randomly selected student received a C or higher is 0.5160.