12 7 5 14 9 2 12 11 5 15 20 14 9 21 14

From this data set, compute the sample mean, median, mode and midrange. Compute the 1st quartile and 3rd and interpret their meanings.

My work:

Mean-(the average) (12+7+5+14+9+2+12+11+5+15+20+14+9+21+14)/15 = 170/15= 11.333

Median-(middle value when placed in order from least to greatest- 2,5,5,7,9,9,11,12,12,14,14,14,15,20,21) so Median= 12 (this is also Q2)

Mode-(number repeated the most), so Mode= 14

Midrange-(maximum value + minimum value divided by 2), so MIdrange= (21+2)/2=23/2=11.5

Q1-(median of data values less than 12) 2,5,5,7,9,9,11, so Q1=7

Q3-(median of data values greater than 12) 14,14,14,15,20,21, the median will be halfway between the 2 middle values: (14+15)/2=14.5

Is this correct? or would you include the 12s when figuring out the Q1 and Q3?