"A company's human resources department was interested in the average number of years that a person works before retiring. The sample of size 11 follows: 12, 16, 18, 19, 21, 21, 21, 22, 24, 24, 26. Based on the values of the arithmetic mean, median, and mode, what is the most likely shape of the distribution (approximately)?"

Options:
a) Normal distribution
b) Positively skewed distribution (right-skewed)
c) Negatively skewed distribution (left-skewed)
d) Bimodal distribution