Test 2 results and scale

Here are the results of test 2 and the approximate grade scale:

average = 21.73 points out of 30 (72.4 %)
median = 22.5
mode = 28
standard deviation = 4.21 (14.03%)

There's a slight negative skew meaning the number of observations above the mean is greater than the number of observations below the mean.

From your raw score you should use the following as a guide for approximate grade:

A: 25.5 and higher
A/B (on the cusp): 25
B: 22 - 24.5
C: 17.5 - 21.5
D: 15 - 17
F: 14.5 and lower