What is the type of distribution, center, and spread of the data?

5 6 5 6 4 4 3 3 5 6 8 12
a. Skewed right; median: 5; interquartile
range: 2

c. Skewed left; median: 5; interquartile
range: 2

b. Normal; mean: 5.6; standard deviation:
2.7

d. Normal; median: 6; interquartile range: 2