Quality control is an important issue at ACME Company which manufacturers light bulbs. In order to conduct testing of the life hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted.
378, 361, 350, 375, 200, 391, 375, 368, 321

-What is the 90^th percentile?

Question

Quizplus · Accepted Answer

To find the 90^th percentile, we first calculate the total number of data points: Total data points = 9 * 9 * 10 * 10 * 10 = 81,000 Next, we calculate the rank of the 90^th percentile: Rank = ceil(0.901 * 81,000) = ceil(72,981.9) = 72,982 Now, we sort the given numbers in ascending order: 148, 152, 168, 182, 201, 215, 238, 246, 267, 281 The 72,982nd number in this list is 391. Therefore, the 90^th percentile is 391. Option C (391) is the correct answer.

Quality Control Is an Important Issue at ACME Company Which