A professor teaches class upon introductory statistics with 200 students. He reports the following data on final exam:
Mean = 60, Median = 60, SD = 25, minimum = 30, maximum = 90
What is the best answer?
Select one:
A. In order to decide whether he can employ the empirical rule to estimate the letter grades (A, B, etc.), we need to see the histogram of the original data.
B. He cannot use the empirical rule to estimate the letter grades (A, B, etc) because the distribution that results from the above data does not fit the empirical rule guidelines.
C. He can use the empirical rule to estimate the letter grades (A, B, etc.) because his distribution has symmetry and the standard deviation is less than the mean.
D. He can use the empirical rule to estimate the letter grades (A, B, etc.) becasuse the mean and the median are equal to each other.