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 mean?
A)375
B)368
C)389.9
D)200
E)346.6

Question

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 mean?
A)375
B)368
C)389.9
D)200
E)346.6

Quizplus · Accepted Answer

The mean (average) is calculated by adding all the values together and then dividing by the number of values. For these light bulbs, the total hours are 378 + 361 + 350 + 375 + 200 + 391 + 375 + 368 + 321 = 3119. Dividing this total by the number of bulbs (9) gives a mean of 3119 / 9 = 346.6 hours.

Quality Control Is an Important Issue at ACME Company Which