Quality control is an important issue at ACME Company which manufactures 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 first quartile?
A)335.5
B)370.5
C)380.6
D)296.8
E)375

Question

Quizplus · Accepted Answer

To find the first quartile, we need to first arrange the data in ascending order: 200, 321, 350, 361, 368, 375, 375, 378, 391. Then, we need to find the median of the lower half of the data. Since there are an odd number of data points in the lower half (4), the median is the middle value, which is 350. Therefore, the first quartile is 350/2 = 335.5.

Quality Control Is an Important Issue at ACME Company Which