Assume that numeric course grades at a certain college are approximately normall
ID: 3205277 • Letter: A
Question
Assume that numeric course grades at a certain college are approximately normally distributed. In terms of standard deviations above the mean of a normal distribution, the cutoff score for the top 20 percent of course grades would lie in which of the following intervals?
a. Between 0 standard deviation and 0.5 standard deviation
b. between 0.5 standard deviation and 1 standard deviation
c. between 1 standard deviation and 1.5 standard deviation
d. between 1.5 standard deviation and 2 standard deviation
Explain your answer
Explanation / Answer
At the top 20%, the top value exists at 80% from the left of the normal distribution curve
From the normal distribution table, the z value for 0.8 is 0.84
Thus the answer is B.