The company financial officer was interested in the average cost of PCs that had been purchased in the past six months. She took a random sample of the price of 10 computers, with the following results. $3,250, $1,127, $2,995, $3,250, $3,445, $3,449, $1,482, $6,120, $3,009, $4,000
What is the 90th percentile?
A) $1,446.50
B) $3,449.00
C) $3,415.75
D) $4,000.00
E) $5,060.00

Question

Quizplus · Accepted Answer

Place scores in ascending order and calculate the index = (p/100)n = (90/100) × 10 = 9. When the index is an integer, take the average of the i and i+1 values: (4000 + 6120)/2 = $5060.

The Company Financial Officer Was Interested in the Average Cost