Use the following to answer the questions below:
Final grades in Professor Albert's large calculus class are approximately normally distributed with a mean of 76 (%) and standard deviation of 8 (%).
-What is the 25th percentile in this course? Report your answer with one decimal place.
A) 70.6%
B) 70.9%
C) 72.3%
D) 71.4%

Question

Quizplus · Accepted Answer

The 25th percentile is the value below which 25% of the data falls. Using a standard normal distribution table, the z-score corresponding to the 25th percentile is -0.674. The corresponding value in the original distribution is 76 + (-0.674 * 8) = 70.6%.

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