Quality Control Is an Important Issue at ACME Company, Which

Multiple Choice

Quality control is an important issue at ACME Company, which manufactures light bulbs. To test the life hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6) . 378, 361, 350, 375, 200, 391, 375, 368, 321
What is the variance?

A) 342.43
B) 3424.3
C) 58.5
D) 191
E) 10,609