Answer:
The third set 49,17,4,18.
Explanation:
Mean for the first set is (26+6+20+36)/4 = 88/4 = 22.
Mean for the 2nd set = 28+15+30+15 / 4 = 22 also.
Mean for the 3rd set = 49+17+4+18 / 4 = 22
Mean for the 4th set = 14+20+24+30/4 ==22.
The mean is the same for all 4 data sets.
On inspection, the set which has the biggest values furthest from 22 is the 3rd set ( values 4 and 49.) so this looks like the one.
The other with more spread than the rest is the first set . We can confirm by working out the Mean Absolute deviation for both sets:
MAD for set 1 =[ (26-22) + (22-6) + (22-20) + (36-22)] / 4 = 9.
MAD for set 3 = [(49-22) + (22-17) + (22-4) + (22-18) ] / 4 = 13.5.
So it is the 3rd set.