Using the short method of calculating the mean, find the group mean of the scores below. Classify the scores in a frequency distribution table.
24 35 30 34 29 33 29 35 28 25 23 21 23 25 22 31 26 32 27 27 33 27 38 22 22 21 21 22 21 22 20 20 18 17 17 16 16 15 15 14 13 12 11 10 14 9 8 8 7 7 6

a. Would you get exactly the same mean if you used the long method? If not, to what may you attribute the difference?​