The scores in a test series were 43, 56,35,47, 48, 52,66,57,46, 39,43,47, 61,55,50, 49,39,40If the scores were organised in deciles series, which series would be the most popular ?

The deciles are:

D1 = 39
D2 = 43
D3 = 46
D4 = 47
D5 = 48
D6 = 50
D7 = 52
D8 = 55
D9 = 56
D10 = 61

The most popular decile is D4, which has 5 scores: 46, 47, 48, 50, and 52.

The other deciles have fewer scores:

D1 has 1 score: 39
D2 has 2 scores: 43 and 46
D3 has 2 scores: 47 and 48
D5 has 2 scores: 50 and 52
D6 has 1 score: 55
D7 has 1 score: 56
D8 has 1 score: 61
D9 has 1 score: 66

Therefore, the most popular decile is D4.