HI All, plz help me solving these..

For the set of data of 20 observations

32, 30, 24, 24, 36, 33, 29, 29, 30, 28

57, 52, 51, 49, 55, 54, 50, 48, 53, 56

a) Find interquartile range, Quartile deviation.

b) Also find out the median and mode by using excel operations.

c) Is data perfectly symmetrical or not .Give answer with arguments?

thnx