CA Foundation · Quantitative Aptitude · Measures of Central Tendency and Dispersion
The daily orders received by a Jaipur e-commerce seller on nine days were: 14, 6, 21, 9, 17, 3, 12, 25, 8. Using the position formula 7(n+1)/10, what is the seventh decile (D7)?
D7 is 17. After sorting the nine values as 3, 6, 8, 9, 12, 14, 17, 21, 25, the position of D7 is 7(9+1)/10 = 7. The seventh sorted value is 17. Reading from the unsorted list would give a wrong answer.
- A21
- B14
- C3
- D17Correct
Explanation
The data must first be sorted: 3, 6, 8, 9, 12, 14, 17, 21, 25. For n = 9, D7 is at position 7×10/10 = 7, which is 17. Reading the seventh item of the unsorted list gives 3, and the eighth sorted item is 21, so both are wrong.
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