Stan divided the lawn into 30 equal plots. He counted the number of daisies in each plot: 12, 15, 8, 16, 24, 5, 13, 2, 34, 21, 18, 15, 12, 8, 4. What is the variance of the number of daisies per plot?
a) 77.07
b) 9.92
c) 110.46
d) 48.33