The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m. ) .They selected 13 patrons and had them get in line between 2 and 3 p.m.Each was given a stopwatch to record the time they spent in line.The times recorded were as follows (in minutes) .
118,124,108,116,99,120,148,118,119,121,45,130,118
What is the 90^th percentile?

Question

Quizplus · Accepted Answer

To find the 90th percentile, we need to first arrange the data in order from smallest to largest: 45, 99, 108, 116, 118, 118, 118, 119, 120, 121, 124, 130, 148.

Next, we calculate the index of the 90th percentile as follows: 
(90/100) x 13 = 11.7
As this is not a whole number, we round up to 12.

The 90th percentile is the value in the 12th position of the ordered data, which is 130. Therefore, the answer is C.

The best choice is C, as it is the only option listed that matches the calculation for the 90th percentile.

The Local Amusement Park Was Interested in the Average Wait