Answer: Choice D. 3
Work Shown:
Given set = {6, 10, 7, 2, 9, 8, 7, 3, 5}
Sorted set = {2, 3, 5, 6, 7, 7, 8, 9, 10}
P = 15 = percentile value
n = 9 = sample size, i.e. number of values in the set
R = index rank
R = (P/100)*(n + 1)
R = (15/100)*(9+1)
R = 1.5
This rounds to R = 2 when rounding to the nearest integer.
This R value tells us to look at the 2nd slot of the sorted data set. The value "3" is in the 2nd slot.
This is why the answer is choice D