I'm sure this problem is easy, but the months are throwing me off. can someone help?

Month Jan Feb Mar Apr May June

students hired 3 2 4 2 6 0

(i) Determine the mean, the median, the mode, and the range for the above data.

(ii) Compute the first and the third quartiles

(iii) Compute the z-scores for the months of may.

i have attempted this but, i'm not sure if i'm doing it right